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
and escapable
.break_list
!= null then
291 v
.error
(self, "Control error: Reached end of break block (a 'break' with a value 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 if n_expr
isa ATrueExpr then
544 v
.warning
(self, "Warning: use 'loop' instead of 'while true do'.")
547 # Prepare inside context (assert cond)
548 v
.use_if_true_variable_ctx
(n_expr
)
551 if n_block
!= null then
552 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
553 v
.enter_visit
(n_block
)
556 v
.variable_ctx
= old_var_ctx
557 v
.base_variable_ctx
= old_base_var_ctx
563 redef class ALoopExpr
564 # The corresponding escapable block
565 readable var _escapable
: nullable EscapableBlock
567 redef fun accept_typing
(v
)
569 var escapable
= new EscapableBlock(self)
570 _escapable
= escapable
571 v
.escapable_ctx
.push
(escapable
, n_label
)
572 var old_var_ctx
= v
.variable_ctx
573 var old_base_var_ctx
= v
.base_variable_ctx
574 v
.base_variable_ctx
= v
.variable_ctx
575 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
578 if n_block
!= null then
579 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
580 v
.enter_visit
(n_block
)
583 v
.variable_ctx
= old_var_ctx
584 v
.base_variable_ctx
= old_base_var_ctx
591 var _variable
: nullable AutoVariable
592 redef fun variable
do return _variable
.as(not null)
594 # The corresponding escapable block
595 readable var _escapable
: nullable EscapableBlock
597 redef fun accept_typing
(v
)
599 var escapable
= new EscapableBlock(self)
600 _escapable
= escapable
601 v
.escapable_ctx
.push
(escapable
, n_label
)
603 var old_var_ctx
= v
.variable_ctx
604 var old_base_var_ctx
= v
.base_variable_ctx
605 v
.base_variable_ctx
= v
.variable_ctx
606 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
607 var va
= new AutoVariable(n_id
.to_symbol
, n_id
)
609 v
.variable_ctx
.add
(va
)
612 v
.enter_visit
(n_expr
)
614 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then return
615 var expr_type
= n_expr
.stype
618 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
619 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
620 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
621 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
622 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
626 if n_block
!= null then v
.enter_visit
(n_block
)
629 v
.variable_ctx
= old_var_ctx
630 v
.base_variable_ctx
= old_base_var_ctx
636 redef class AAssertExpr
637 redef fun accept_typing
(v
)
640 v
.enter_visit
(n_expr
)
641 v
.check_conform_expr
(n_expr
, v
.type_bool
)
643 # Process optional 'else' part
644 if n_else
!= null then
645 var old_var_ctx
= v
.variable_ctx
646 v
.use_if_false_variable_ctx
(n_expr
)
647 v
.enter_visit
(n_else
)
648 v
.variable_ctx
= old_var_ctx
652 v
.use_if_true_variable_ctx
(n_expr
)
657 redef class AVarFormExpr
658 var _variable
: nullable Variable
659 redef fun variable
do return _variable
.as(not null)
663 redef fun its_variable
do return variable
665 redef fun after_typing
(v
)
667 v
.variable_ctx
.check_is_set
(self, variable
)
668 _stype
= v
.variable_ctx
.stype
(variable
)
669 _is_typed
= _stype
!= null
673 redef class AVarAssignExpr
674 redef fun after_typing
(v
)
676 v
.variable_ctx
.mark_is_set
(variable
)
678 # Check the base type
679 var btype
= v
.base_variable_ctx
.stype
(variable
)
680 if not v
.check_expr
(n_value
) then return
681 if btype
!= null and not v
.check_conform_expr
(n_value
, btype
) then return
684 v
.variable_ctx
.stype
(variable
) = n_value
.stype
690 redef class AReassignFormExpr
691 # Compute and check method used through the reassigment operator
692 # On success return the static type of the result of the reassigment operator
693 # Else display an error and return null
694 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
696 if type_lvalue
== null then
699 var name
= n_assign_op
.method_name
700 var lc
= type_lvalue
.local_class
701 if not lc
.has_global_property_by_name
(name
) then
702 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
705 var prop
= lc
.select_method
(name
)
706 prop
.global
.check_visibility
(v
, self, v
.module, false)
707 var psig
= prop
.signature_for
(type_lvalue
)
708 _assign_method
= prop
709 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
710 return psig
.return_type
.not_for_self
713 redef fun assign_method
do return _assign_method
.as(not null)
714 var _assign_method
: nullable MMMethod
717 redef class AVarReassignExpr
718 redef fun after_typing
(v
)
720 v
.variable_ctx
.check_is_set
(self, variable
)
721 v
.variable_ctx
.mark_is_set
(variable
)
722 var t
= v
.variable_ctx
.stype
(variable
)
723 var t2
= do_rvalue_typing
(v
, t
)
724 if t2
== null then return
726 # Check the base type
727 var btype
= v
.base_variable_ctx
.stype
(variable
)
728 if not v
.check_expr
(n_value
) then return
729 if btype
!= null and not v
.check_conform
(n_value
, t2
, btype
) then return
732 v
.variable_ctx
.stype
(variable
) = t2
738 redef class AAssignOp
739 fun method_name
: Symbol is abstract
741 redef class APlusAssignOp
742 redef fun method_name
do return once
"+".to_symbol
744 redef class AMinusAssignOp
745 redef fun method_name
do return once
"-".to_symbol
748 redef class ASelfExpr
749 var _variable
: nullable ParamVariable
750 redef fun variable
do return _variable
.as(not null)
752 redef fun its_variable
do return variable
754 redef fun after_typing
(v
)
756 _variable
= v
.self_var
757 _stype
= v
.variable_ctx
.stype
(variable
)
761 redef fun is_self
do return true
764 redef class AImplicitSelfExpr
765 redef fun is_implicit_self
do return true
768 redef class AIfexprExpr
769 redef fun accept_typing
(v
)
771 var old_var_ctx
= v
.variable_ctx
774 v
.enter_visit
(n_expr
)
775 v
.check_conform_expr
(n_expr
, v
.type_bool
)
777 # Prepare 'then' context
778 v
.use_if_true_variable_ctx
(n_expr
)
781 v
.enter_visit
(n_then
)
783 # Prepare 'else' context
784 v
.variable_ctx
= old_var_ctx
785 v
.use_if_false_variable_ctx
(n_expr
)
788 v
.enter_visit
(n_else
)
790 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
791 if stype
== null then return
798 redef class ABoolExpr
799 redef fun after_typing
(v
)
807 redef fun accept_typing
(v
)
809 var old_var_ctx
= v
.variable_ctx
810 var stype
= v
.type_bool
813 # Process left operand
814 v
.enter_visit
(n_expr
)
816 # Prepare right operand context
817 v
.use_if_false_variable_ctx
(n_expr
)
819 # Process right operand
820 v
.enter_visit
(n_expr2
)
821 if n_expr2
.if_false_variable_ctx
!= null then
822 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
824 _if_false_variable_ctx
= v
.variable_ctx
827 v
.variable_ctx
= old_var_ctx
829 v
.check_conform_expr
(n_expr
, stype
)
830 v
.check_conform_expr
(n_expr2
, stype
)
837 redef fun accept_typing
(v
)
839 var old_var_ctx
= v
.variable_ctx
840 var stype
= v
.type_bool
842 # Process left operand
843 v
.enter_visit
(n_expr
)
845 # Prepare right operand context
846 v
.use_if_true_variable_ctx
(n_expr
)
848 # Process right operand
849 v
.enter_visit
(n_expr2
)
850 if n_expr2
.if_true_variable_ctx
!= null then
851 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
853 _if_true_variable_ctx
= v
.variable_ctx
856 v
.variable_ctx
= old_var_ctx
858 v
.check_conform_expr
(n_expr
, stype
)
859 v
.check_conform_expr
(n_expr2
, stype
)
866 redef fun after_typing
(v
)
868 v
.check_conform_expr
(n_expr
, v
.type_bool
)
870 # Invert if_true/if_false information
871 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
872 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
880 redef fun after_typing
(v
)
887 redef class AFloatExpr
888 redef fun after_typing
(v
)
890 _stype
= v
.type_float
895 redef class ACharExpr
896 redef fun after_typing
(v
)
903 redef class AStringFormExpr
904 redef fun after_typing
(v
)
906 _stype
= v
.type_string
911 redef class ASuperstringExpr
912 redef fun atype
do return _atype
.as(not null)
913 var _atype
: nullable MMType
914 redef fun after_typing
(v
)
916 var stype
= v
.type_string
918 var atype
= v
.type_array
(stype
)
924 redef class ANullExpr
925 redef fun after_typing
(v
)
932 redef class AArrayExpr
933 redef fun after_typing
(v
)
935 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
936 if stype
!= null then do_typing
(v
, stype
)
939 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
941 _stype
= v
.type_array
(element_type
)
946 redef class ARangeExpr
947 redef fun after_typing
(v
)
949 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
950 var ntype
= n_expr
.stype
951 var ntype2
= n_expr2
.stype
952 if ntype
< ntype2
then
954 else if not ntype2
< ntype
then
955 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
958 var dtype
= v
.type_discrete
959 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
960 _stype
= v
.type_range
(ntype
)
965 redef class ASuperExpr
966 redef readable var _init_in_superclass
: nullable MMMethod
967 redef fun compute_raw_arguments
do return n_args
.to_a
968 redef fun after_typing
(v
)
970 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
971 if not precs
.is_empty
then
972 v
.local_property
.need_super
= true
973 else if v
.local_property
.global
.is_init
then
974 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
975 for p
in base_precs
do
976 if not p
.global
.is_init
then
977 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
979 precs
.add
(v
.local_class
[p
.global
])
982 if precs
.is_empty
then
983 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
985 else if precs
.length
> 1 then
986 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
989 var p
= base_precs
.first
990 assert p
isa MMMethod
991 _init_in_superclass
= p
992 register_super_init_call
(v
, p
)
993 if n_args
.length
> 0 then
994 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
995 process_signature
(v
, signature
, p
.name
, compute_raw_arguments
)
998 v
.error
(self, "Error: No super method to call for {v.local_property}.")
1002 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
1003 var stypes
= new Array[MMType]
1004 var stype
: nullable MMType = null
1005 for prop
in precs
do
1006 assert prop
isa MMMethod
1007 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
)
1009 if stype
== null or stype
< t
then
1014 v
.check_conform
(self, t
, stype
.as(not null))
1018 var p
= v
.local_property
1019 assert p
isa MMSrcMethod
1025 redef class AAttrFormExpr
1026 redef fun prop
do return _prop
.as(not null)
1027 var _prop
: nullable MMAttribute
1029 redef fun attr_type
do return _attr_type
.as(not null)
1030 var _attr_type
: nullable MMType
1032 # Compute the attribute accessed
1033 private fun do_typing
(v
: TypingVisitor)
1035 if not v
.check_expr
(n_expr
) then return
1036 var type_recv
= n_expr
.stype
1037 var name
= n_id
.to_symbol
1038 var lc
= type_recv
.local_class
1039 if not lc
.has_global_property_by_name
(name
) then
1040 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1043 var prop
= lc
.select_attribute
(name
)
1044 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1045 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1048 var at
= prop
.signature_for
(type_recv
).return_type
1049 if not n_expr
.is_self
then at
= at
.not_for_self
1054 redef class AAttrExpr
1055 redef fun after_typing
(v
)
1058 if _prop
== null then return
1064 redef class AAttrAssignExpr
1065 redef fun after_typing
(v
)
1068 if _prop
== null then return
1069 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1074 redef class AAttrReassignExpr
1075 redef fun after_typing
(v
)
1078 if _prop
== null then return
1079 var t
= do_rvalue_typing
(v
, attr_type
)
1080 if t
== null then return
1081 v
.check_conform
(self, t
, n_value
.stype
)
1086 redef class AIssetAttrExpr
1087 redef fun after_typing
(v
)
1090 if _prop
== null then return
1091 if attr_type
.is_nullable
then
1092 v
.error
(self, "Error: isset on a nullable attribute.")
1094 _stype
= v
.type_bool
1099 redef class AAbsAbsSendExpr
1100 # The signature of the called property
1101 redef fun prop_signature
do return _prop_signature
.as(not null)
1102 var _prop_signature
: nullable MMSignature
1104 # Raw arguments used (without vararg transformation)
1105 redef fun raw_arguments
: Array[AExpr]
1107 var res
= _raw_arguments_cache
1111 res
= compute_raw_arguments
1112 if res
== null then res
= new Array[AExpr]
1113 _raw_arguments_cache
= res
1118 var _raw_arguments_cache
: nullable Array[AExpr] = null
1120 fun compute_raw_arguments
: nullable Array[AExpr]
1122 print
"{location} no compute_raw_arguments"
1126 # Check the conformity of a set of arguments `raw_args' to a signature.
1127 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): Bool
1129 var par_vararg
= psig
.vararg_rank
1130 var par_arity
= psig
.arity
1132 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1133 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1134 v
.error
(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
1138 for par_idx
in [0..par_arity
[ do
1140 var par_type
= psig
[par_idx
]
1141 if par_idx
== par_vararg
then
1142 for i
in [0..(raw_arity-par_arity
)] do
1143 a
= raw_args
[arg_idx
]
1144 v
.check_conform_expr
(a
, par_type
)
1145 arg_idx
= arg_idx
+ 1
1148 a
= raw_args
[arg_idx
]
1149 v
.check_conform_expr
(a
, par_type
)
1150 arg_idx
= arg_idx
+ 1
1156 # Check the conformity of a set of defined closures
1157 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1159 var t
= psig
.return_type
1160 var cs
= psig
.closures
# Declared closures
1163 if not c
.is_optional
then min_arity
+= 1
1166 if cd
!= null then arity
= cd
.length
1167 if cs
.length
> 0 then
1168 if arity
== 0 and min_arity
> 0 then
1169 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1170 else if arity
> cs
.length
or arity
< min_arity
then
1171 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1173 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1174 var break_list
: nullable Array[ABreakExpr] = null
1175 if t
!= null then break_list
= new Array[ABreakExpr]
1177 # The n_label, is any in only set on the last decl
1178 var n_label
= if arity
> 0 then cd
[arity-1
].n_label
else null
1180 # Process each closure definition
1181 for i
in [0..arity
[ do
1183 var cni
= cdi
.n_id
.to_symbol
1184 var csi
= psig
.closure_named
(cni
)
1186 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1187 v
.escapable_ctx
.push
(esc
, n_label
)
1188 cdi
.accept_typing2
(v
, esc
)
1190 else if cs
.length
== 1 then
1191 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
1193 var a
= new Array[String]
1197 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
1201 # Check break type conformity
1202 if break_list
!= null then
1203 t
= v
.check_conform_multiexpr
(t
, break_list
)
1206 else if arity
!= 0 then
1207 v
.error
(self, "Error: {name} does not require blocks.")
1213 redef class AAbsSendExpr
1214 # Compute the called global property
1215 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])
1217 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1218 if prop
== null then return
1219 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1220 if not process_signature
(v
, sig
, prop
.name
, raw_args
) then return
1221 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1222 if rtype
== null and sig
.return_type
!= null then return
1224 _prop_signature
= sig
1225 _return_type
= rtype
1228 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1230 var lc
= type_recv
.local_class
1231 var prop
: nullable MMMethod = null
1232 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1233 if prop
== null and v
.local_property
.global
.is_init
then
1234 var props
= type_recv
.local_class
.super_methods_named
(name
)
1235 if props
.length
> 1 then
1236 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1238 else if props
.length
== 1 then
1239 var p
= type_recv
.local_class
[props
.first
.global
]
1240 assert p
isa MMMethod
1245 if prop
== null then
1246 if is_implicit_self
then
1247 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1249 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1256 # Get the signature for a local property and a receiver
1257 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1259 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1260 var psig
= prop
.signature_for
(type_recv
)
1261 if not recv_is_self
then psig
= psig
.not_for_self
1265 # The invoked method (once computed)
1266 redef fun prop
do return _prop
.as(not null)
1267 var _prop
: nullable MMMethod
1269 # The return type (if any) (once computed)
1270 redef readable var _return_type
: nullable MMType
1273 # A possible call of constructor in a super class
1274 # Could be an explicit call or with the 'super' keyword
1275 redef class ASuperInitCall
1276 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1278 if parent
!= v
.top_block
and self != v
.top_block
then
1279 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1281 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1282 var prev_class
: nullable MMLocalClass = null
1283 var esic
= v
.explicit_super_init_calls
.as(not null)
1284 if not esic
.is_empty
then
1285 prev_class
= esic
.last
.global
.intro
.local_class
1287 var order
= v
.local_class
.cshe
.reverse_linear_extension
1288 if cla
== v
.local_class
then
1289 v
.explicit_other_init_call
= true
1290 else if not order
.has
(cla
) then
1291 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1292 else if cla
== prev_class
then
1293 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1295 var last_is_found
= prev_class
== null
1297 if c
== prev_class
then
1298 last_is_found
= true
1299 else if c
== cla
then
1300 if not last_is_found
then
1301 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1312 redef class ANewExpr
1313 redef fun compute_raw_arguments
do return n_args
.to_a
1314 redef fun after_typing
(v
)
1316 if not n_type
.is_typed
then return
1317 var t
= n_type
.stype
1318 if t
.local_class
.global
.is_abstract
then
1319 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1323 if n_id
== null then
1324 name
= once
"init".to_symbol
1326 name
= n_id
.to_symbol
1329 do_typing
(v
, t
, false, false, name
, raw_arguments
, null)
1330 if _prop
== null then return
1332 if not prop
.global
.is_init
then
1333 v
.error
(self, "Error: {prop} is not a constructor.")
1342 redef class ASendExpr
1343 # Name of the invoked property
1344 fun name
: Symbol is abstract
1346 # Closure definitions
1347 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1349 redef fun after_typing
(v
)
1354 private fun do_all_typing
(v
: TypingVisitor)
1356 if not v
.check_expr
(n_expr
) then return
1357 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1358 if _prop
== null then return
1359 var prop
= _prop
.as(not null)
1361 if prop
.global
.is_init
then
1362 if not v
.local_property
.global
.is_init
then
1363 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1364 else if not n_expr
.is_self
then
1365 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1367 register_super_init_call
(v
, prop
)
1371 _stype
= return_type
1376 redef class ASendReassignExpr
1377 redef fun read_prop
do return _read_prop
.as(not null)
1378 var _read_prop
: nullable MMMethod
1379 redef fun do_all_typing
(v
)
1381 if not v
.check_expr
(n_expr
) then return
1382 var raw_args
= raw_arguments
1383 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1385 if prop
== null then return
1386 if prop
.global
.is_init
then
1387 if not v
.local_property
.global
.is_init
then
1388 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1389 else if not n_expr
.is_self
then
1390 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1393 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1394 if not n_expr
.is_self
then t
= t
.not_for_self
1396 var t2
= do_rvalue_typing
(v
, t
)
1397 if t2
== null then return
1398 v
.check_conform
(self, t2
, n_value
.stype
)
1401 raw_args
= raw_args
.to_a
1402 raw_args
.add
(n_value
)
1404 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1405 if prop
.global
.is_init
then
1406 if not v
.local_property
.global
.is_init
then
1407 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1408 else if not n_expr
.is_self
then
1409 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1417 redef class ABinopExpr
1418 redef fun compute_raw_arguments
do return [n_expr2
]
1421 redef fun name
do return once
"==".to_symbol
1422 redef fun after_typing
(v
)
1425 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1426 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1427 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1428 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1431 if n_expr
.stype
isa MMTypeNone then
1432 try_to_isa
(v
, n_expr2
)
1433 else if n_expr2
.stype
isa MMTypeNone then
1434 try_to_isa
(v
, n_expr
)
1438 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1440 var variable
= n
.its_variable
1441 if variable
!= null then
1442 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1447 redef fun name
do return once
"!=".to_symbol
1448 redef fun after_typing
(v
)
1451 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1452 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1453 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1454 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1457 if n_expr
.stype
isa MMTypeNone then
1458 try_to_isa
(v
, n_expr2
)
1459 else if n_expr2
.stype
isa MMTypeNone then
1460 try_to_isa
(v
, n_expr
)
1464 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1466 var variable
= n
.its_variable
1467 if variable
!= null then
1468 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1473 redef fun name
do return once
"<".to_symbol
1476 redef fun name
do return once
"<=".to_symbol
1479 redef fun name
do return once
">".to_symbol
1482 redef fun name
do return once
">=".to_symbol
1484 redef class APlusExpr
1485 redef fun name
do return once
"+".to_symbol
1487 redef class AMinusExpr
1488 redef fun name
do return once
"-".to_symbol
1490 redef class AStarshipExpr
1491 redef fun name
do return once
"<=>".to_symbol
1493 redef class AStarExpr
1494 redef fun name
do return once
"*".to_symbol
1496 redef class ASlashExpr
1497 redef fun name
do return once
"/".to_symbol
1499 redef class APercentExpr
1500 redef fun name
do return once
"%".to_symbol
1503 redef class AUminusExpr
1504 redef fun name
do return once
"unary -".to_symbol
1505 redef fun compute_raw_arguments
do return null
1508 redef class ACallFormExpr
1509 redef fun after_typing
(v
)
1511 if n_expr
.is_implicit_self
then
1512 var name
= n_id
.to_symbol
1513 var variable
= v
.variable_ctx
[name
]
1514 if variable
!= null then
1516 if variable
isa ClosureVariable then
1517 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1518 n
._variable
= variable
1520 if not n_args
.is_empty
then
1521 v
.error
(self, "Error: {name} is variable, not a function.")
1524 n
= variable_create
(variable
)
1525 n
._variable
= variable
1536 redef fun closure_defs
1538 if n_closure_defs
.is_empty
then
1541 return n_closure_defs
.to_a
1545 # Create a variable acces corresponding to the call form
1546 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1549 redef class ACallExpr
1550 redef fun variable_create
(variable
)
1552 return new AVarExpr.init_avarexpr
(n_id
)
1555 redef fun name
do return n_id
.to_symbol
1556 redef fun compute_raw_arguments
do return n_args
.to_a
1559 redef class ACallAssignExpr
1560 redef fun variable_create
(variable
)
1562 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1565 redef fun name
do return (n_id
.text
+ "=").to_symbol
1566 redef fun compute_raw_arguments
do
1567 var res
= n_args
.to_a
1573 redef class ACallReassignExpr
1574 redef fun variable_create
(variable
)
1576 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1579 redef fun name
do return n_id
.to_symbol
1580 redef fun compute_raw_arguments
do return n_args
.to_a
1583 redef class ABraExpr
1584 redef fun name
do return once
"[]".to_symbol
1585 redef fun compute_raw_arguments
do return n_args
.to_a
1586 redef fun closure_defs
1588 if n_closure_defs
.is_empty
then
1591 return n_closure_defs
.to_a
1596 redef class ABraAssignExpr
1597 redef fun name
do return once
"[]=".to_symbol
1598 redef fun compute_raw_arguments
do
1599 var res
= n_args
.to_a
1605 redef class ABraReassignExpr
1606 redef fun name
do return once
"[]".to_symbol
1607 redef fun compute_raw_arguments
do return n_args
.to_a
1610 redef class AInitExpr
1611 redef fun name
do return once
"init".to_symbol
1612 redef fun compute_raw_arguments
do return n_args
.to_a
1615 redef class AClosureCallExpr
1616 var _variable
: nullable ClosureVariable
1617 redef fun variable
do return _variable
.as(not null)
1618 redef fun compute_raw_arguments
do return n_args
.to_a
1620 redef fun after_typing
(v
)
1623 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1624 var sig
= va
.closure
.signature
1625 var s
= process_signature
(v
, sig
, n_id
.to_symbol
, compute_raw_arguments
)
1626 if not n_closure_defs
.is_empty
then
1627 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1629 if not s
then return
1630 _prop_signature
= sig
1631 _stype
= sig
.return_type
1636 redef class AClosureId
1637 fun to_symbol
: Symbol is abstract
1639 redef class ASimpleClosureId
1640 redef fun to_symbol
: Symbol do return n_id
.to_symbol
1642 redef class ABreakClosureId
1643 redef fun to_symbol
: Symbol do return n_kwbreak
.to_symbol
1646 redef class AClosureDef
1647 var _closure
: nullable MMClosure
1648 redef fun closure
do return _closure
.as(not null)
1650 # The corresponding escapable object
1651 readable var _escapable
: nullable EscapableBlock
1653 var _accept_typing2
: Bool = false
1654 redef fun accept_typing
(v
)
1656 # Typing is deferred, wait accept_typing2(v)
1657 if _accept_typing2
then super
1660 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1664 var sig
= esc
.closure
.signature
1665 if sig
.arity
!= n_ids
.length
then
1666 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
1670 _closure
= esc
.closure
1672 var old_var_ctx
= v
.variable_ctx
1673 var old_base_var_ctx
= v
.base_variable_ctx
1674 v
.base_variable_ctx
= v
.variable_ctx
1675 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1676 variables
= new Array[AutoVariable]
1677 for i
in [0..n_ids
.length
[ do
1678 var va
= new AutoVariable(n_ids
[i
].to_symbol
, n_ids
[i
])
1681 v
.variable_ctx
.add
(va
)
1684 _accept_typing2
= true
1687 if v
.variable_ctx
.unreash
== false then
1688 if closure
.signature
.return_type
!= null then
1689 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1690 else if closure
.is_break
and esc
.break_list
!= null then
1691 v
.error
(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
1694 v
.variable_ctx
= old_var_ctx
1695 v
.base_variable_ctx
= old_base_var_ctx
1699 class ATypeCheckExpr
1701 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1703 if not v
.check_expr
(n_expr
) then return
1704 if not n_type
.is_typed
then return
1705 var etype
= n_expr
.stype
1706 var ttype
= n_type
.stype
1707 if etype
== ttype
then
1708 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1709 else if etype
< ttype
then
1710 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1711 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1712 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1713 # No warning in this case since with
1714 # type T: nullable A
1716 # 'x.as(not null)' != 'x.as(T)'
1717 # 'x != null' != 'x isa T'
1718 else if self isa AIsaExpr then
1719 v
.warning
(self, "Warning: Prefer '!= null'.")
1721 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1727 redef class AIsaExpr
1728 special ATypeCheckExpr
1729 redef fun after_typing
(v
)
1731 check_expr_cast
(v
, n_expr
, n_type
)
1732 if not n_type
.is_typed
then return
1733 var variable
= n_expr
.its_variable
1734 if variable
!= null then
1735 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1737 _stype
= v
.type_bool
1742 redef class AAsCastExpr
1743 special ATypeCheckExpr
1744 redef fun after_typing
(v
)
1746 check_expr_cast
(v
, n_expr
, n_type
)
1747 if not n_type
.is_typed
then return
1748 _stype
= n_type
.stype
1749 _is_typed
= _stype
!= null
1753 redef class AAsNotnullExpr
1754 redef fun after_typing
(v
)
1756 if not v
.check_expr
(n_expr
) then return
1757 var t
= n_expr
.stype
1758 if t
isa MMTypeNone then
1759 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1761 else if not t
.is_nullable
then
1762 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1764 _stype
= n_expr
.stype
.as_notnull
1769 redef class AProxyExpr
1770 redef fun after_typing
(v
)
1772 if not n_expr
.is_typed
then return
1774 if n_expr
.is_statement
then return
1775 _stype
= n_expr
.stype
1779 redef class AOnceExpr
1780 redef fun accept_typing
(v
)
1782 if v
.once_count
> 0 then
1783 v
.warning
(self, "Useless once in a once expression.")
1785 v
.once_count
= v
.once_count
+ 1
1789 v
.once_count
= v
.once_count
- 1