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.as(not null)}")
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.as(not null)}")
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 v
.variable_ctx
= old_var_ctx
297 v
.base_variable_ctx
= old_base_var_ctx
303 redef fun stype
: MMType do return _stype
.as(not null)
304 redef fun is_typed
: Bool do return _stype
!= null
305 var _stype
: nullable MMType
307 redef fun after_typing
(v
)
309 _stype
= get_stype
(v
)
314 redef readable var _is_typed
: Bool = false
315 redef fun is_statement
: Bool do return _stype
== null
319 print
"{location}: not is_typed"
323 print
"{location}: is_statement"
326 return _stype
.as(not null)
328 var _stype
: nullable MMType
330 redef fun after_typing
(v
)
332 # Default behavior is to be happy
336 # Is the expression the implicit receiver
337 fun is_implicit_self
: Bool do return false
339 # Is the expression the current receiver (implicit or explicit)
340 fun is_self
: Bool do return false
342 # The variable accessed is any
343 fun its_variable
: nullable Variable do return null
345 # The variable type information if current boolean expression is true
346 readable private var _if_true_variable_ctx
: nullable VariableContext
348 # The variable type information if current boolean expression is false
349 readable private var _if_false_variable_ctx
: nullable VariableContext
352 redef class AVardeclExpr
353 var _variable
: nullable VarVariable
354 redef fun variable
do return _variable
.as(not null)
356 redef fun after_typing
(v
)
358 var va
= new VarVariable(n_id
.to_symbol
, n_id
)
360 v
.variable_ctx
.add
(va
)
362 if ne
!= null then v
.variable_ctx
.mark_is_set
(va
)
364 if n_type
!= null then
365 if not n_type
.is_typed
then return
366 va
.stype
= n_type
.stype
368 v
.check_conform_expr
(ne
, va
.stype
)
370 else if ne
!= null then
371 if not v
.check_expr
(ne
) then return
374 va
.stype
= v
.type_object
.as_nullable
380 redef class ABlockExpr
381 redef fun accept_typing
(v
)
384 if not v
.variable_ctx
.unreash
then
386 else if not v
.variable_ctx
.already_unreash
then
387 v
.variable_ctx
.already_unreash
= true
388 v
.error
(e
, "Error: unreachable statement.")
396 redef class AReturnExpr
397 redef fun after_typing
(v
)
399 v
.variable_ctx
.unreash
= true
400 var t
= v
.local_property
.signature
.return_type
402 if e
== null and t
!= null then
403 v
.error
(self, "Error: Return without value in a function.")
404 else if e
!= null and t
== null then
405 v
.error
(self, "Error: Return with value in a procedure.")
406 else if e
!= null and t
!= null then
407 v
.check_conform_expr
(e
, t
)
413 redef class AContinueExpr
414 redef fun after_typing
(v
)
416 v
.variable_ctx
.unreash
= true
417 var esc
= compute_escapable_block
(v
.escapable_ctx
)
418 if esc
== null then return
420 if esc
.is_break_block
then
421 v
.error
(self, "Error: cannot 'continue', only 'break'.")
425 var t
= esc
.continue_stype
426 if n_expr
== null and t
!= null then
427 v
.error
(self, "Error: continue with a value required in this block.")
428 else if n_expr
!= null and t
== null then
429 v
.error
(self, "Error: continue without value required in this block.")
430 else if n_expr
!= null and t
!= null then
431 v
.check_conform_expr
(n_expr
.as(not null), t
)
437 redef class ABreakExpr
438 redef fun after_typing
(v
)
440 v
.variable_ctx
.unreash
= true
441 var esc
= compute_escapable_block
(v
.escapable_ctx
)
442 if esc
== null then return
444 esc
.break_variable_contexts
.add
(v
.variable_ctx
)
446 var bl
= esc
.break_list
447 if n_expr
== null and bl
!= null then
448 v
.error
(self, "Error: break with a value required in this block.")
449 else if n_expr
!= null and bl
== null then
450 v
.error
(self, "Error: break without value required in this block.")
451 else if n_expr
!= null and bl
!= null then
452 # Typing check can only be done later
453 bl
.add
(n_expr
.as(not null))
459 redef class AAbortExpr
460 redef fun after_typing
(v
)
462 v
.variable_ctx
.unreash
= true
468 # The corresponding escapable block
469 readable var _escapable
: nullable EscapableBlock
471 redef fun accept_typing
(v
)
473 var escapable
= new BreakOnlyEscapableBlock(self)
474 _escapable
= escapable
475 v
.escapable_ctx
.push
(escapable
, n_label
)
476 var old_var_ctx
= v
.variable_ctx
478 v
.variable_ctx
= old_var_ctx
.sub
(self)
481 # Add the end of the block as an exit context
482 if not v
.variable_ctx
.unreash
then
483 escapable
.break_variable_contexts
.add
(v
.variable_ctx
)
486 # Merge all exit contexts
487 if not escapable
.break_variable_contexts
.is_empty
then
488 v
.variable_ctx
= old_var_ctx
.merge
(self, escapable
.break_variable_contexts
, v
.base_variable_ctx
)
497 redef fun accept_typing
(v
)
499 var old_var_ctx
= v
.variable_ctx
500 v
.enter_visit
(n_expr
)
501 v
.check_conform_expr
(n_expr
, v
.type_bool
)
503 # Prepare 'then' context
504 v
.use_if_true_variable_ctx
(n_expr
)
507 if n_then
!= null then
508 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
509 v
.enter_visit
(n_then
)
512 # Remember what appened in the 'then'
513 var then_var_ctx
= v
.variable_ctx
515 # Prepare 'else' context
516 v
.variable_ctx
= old_var_ctx
517 v
.use_if_false_variable_ctx
(n_expr
)
520 if n_else
!= null then
521 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
522 v
.enter_visit
(n_else
)
525 # Merge 'then' and 'else' contexts
526 v
.variable_ctx
= old_var_ctx
.merge_reash
(self, then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
531 redef class AWhileExpr
532 # The corresponding escapable block
533 readable var _escapable
: nullable EscapableBlock
535 redef fun accept_typing
(v
)
537 var escapable
= new EscapableBlock(self)
538 _escapable
= escapable
539 v
.escapable_ctx
.push
(escapable
, n_label
)
540 var old_var_ctx
= v
.variable_ctx
541 var old_base_var_ctx
= v
.base_variable_ctx
542 v
.base_variable_ctx
= v
.variable_ctx
545 v
.enter_visit
(n_expr
)
546 v
.check_conform_expr
(n_expr
, v
.type_bool
)
548 if n_expr
isa ATrueExpr then
549 v
.warning
(self, "Warning: use 'loop' instead of 'while true do'.")
552 # Prepare inside context (assert cond)
553 v
.use_if_true_variable_ctx
(n_expr
)
556 if n_block
!= null then
557 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
558 v
.enter_visit
(n_block
)
561 # Compute outside context (assert !cond + all breaks)
562 v
.variable_ctx
= old_var_ctx
563 v
.use_if_false_variable_ctx
(n_expr
)
564 escapable
.break_variable_contexts
.add
(v
.variable_ctx
)
565 v
.variable_ctx
= old_var_ctx
.merge
(self, escapable
.break_variable_contexts
, v
.base_variable_ctx
)
567 v
.base_variable_ctx
= old_base_var_ctx
573 redef class ALoopExpr
574 # The corresponding escapable block
575 readable var _escapable
: nullable EscapableBlock
577 redef fun accept_typing
(v
)
579 var escapable
= new EscapableBlock(self)
580 _escapable
= escapable
581 v
.escapable_ctx
.push
(escapable
, n_label
)
582 var old_var_ctx
= v
.variable_ctx
583 var old_base_var_ctx
= v
.base_variable_ctx
584 v
.base_variable_ctx
= v
.variable_ctx
587 if n_block
!= null then
588 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
589 v
.enter_visit
(n_block
)
592 # Compute outside context (assert all breaks)
593 if escapable
.break_variable_contexts
.is_empty
then
594 old_var_ctx
.unreash
= true
595 v
.variable_ctx
= old_var_ctx
597 v
.variable_ctx
= old_var_ctx
.merge
(self, escapable
.break_variable_contexts
, v
.base_variable_ctx
)
600 v
.base_variable_ctx
= old_base_var_ctx
607 var _variable
: nullable AutoVariable
608 redef fun variable
do return _variable
.as(not null)
610 # The corresponding escapable block
611 readable var _escapable
: nullable EscapableBlock
613 redef fun accept_typing
(v
)
615 var escapable
= new EscapableBlock(self)
616 _escapable
= escapable
617 v
.escapable_ctx
.push
(escapable
, n_label
)
619 var old_var_ctx
= v
.variable_ctx
620 var old_base_var_ctx
= v
.base_variable_ctx
621 v
.base_variable_ctx
= v
.variable_ctx
622 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
623 var va
= new AutoVariable(n_id
.to_symbol
, n_id
)
625 v
.variable_ctx
.add
(va
)
628 v
.enter_visit
(n_expr
)
630 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then
631 v
.variable_ctx
= old_var_ctx
632 v
.base_variable_ctx
= old_base_var_ctx
636 var expr_type
= n_expr
.stype
639 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
640 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
641 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
642 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
643 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
647 if n_block
!= null then v
.enter_visit
(n_block
)
650 v
.variable_ctx
= old_var_ctx
651 v
.base_variable_ctx
= old_base_var_ctx
657 redef class AAssertExpr
658 redef fun accept_typing
(v
)
661 v
.enter_visit
(n_expr
)
662 v
.check_conform_expr
(n_expr
, v
.type_bool
)
664 # Process optional 'else' part
665 if n_else
!= null then
666 var old_var_ctx
= v
.variable_ctx
667 v
.use_if_false_variable_ctx
(n_expr
)
668 v
.enter_visit
(n_else
)
669 v
.variable_ctx
= old_var_ctx
673 v
.use_if_true_variable_ctx
(n_expr
)
678 redef class AVarFormExpr
679 var _variable
: nullable Variable
680 redef fun variable
do return _variable
.as(not null)
684 redef fun its_variable
do return variable
686 redef fun after_typing
(v
)
688 v
.variable_ctx
.check_is_set
(self, variable
)
689 _stype
= v
.variable_ctx
.stype
(variable
)
690 _is_typed
= _stype
!= null
694 redef class AVarAssignExpr
695 redef fun after_typing
(v
)
697 v
.variable_ctx
.mark_is_set
(variable
)
699 # Check the base type
700 var btype
= v
.base_variable_ctx
.stype
(variable
)
701 if not v
.check_expr
(n_value
) then return
702 if btype
!= null and not v
.check_conform_expr
(n_value
, btype
) then return
705 v
.variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_value
.stype
)
711 redef class AReassignFormExpr
712 # Compute and check method used through the reassigment operator
713 # On success return the static type of the result of the reassigment operator
714 # Else display an error and return null
715 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
717 if type_lvalue
== null then
720 var name
= n_assign_op
.method_name
721 if type_lvalue
isa MMTypeNone then
722 v
.error
(self, "Error: Method '{name}' call on 'null'.")
725 var lc
= type_lvalue
.local_class
726 if not lc
.has_global_property_by_name
(name
) then
727 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
730 var prop
= lc
.select_method
(name
)
731 prop
.global
.check_visibility
(v
, self, v
.module, false)
732 var psig
= prop
.signature_for
(type_lvalue
)
733 _assign_method
= prop
734 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
735 return psig
.return_type
.not_for_self
738 redef fun assign_method
do return _assign_method
.as(not null)
739 var _assign_method
: nullable MMMethod
742 redef class AVarReassignExpr
743 redef fun after_typing
(v
)
745 v
.variable_ctx
.check_is_set
(self, variable
)
746 v
.variable_ctx
.mark_is_set
(variable
)
747 var t
= v
.variable_ctx
.stype
(variable
)
748 var t2
= do_rvalue_typing
(v
, t
)
749 if t2
== null then return
751 # Check the base type
752 var btype
= v
.base_variable_ctx
.stype
(variable
)
753 if not v
.check_expr
(n_value
) then return
754 if btype
!= null and not v
.check_conform
(n_value
, t2
, btype
) then return
757 v
.variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, t2
)
763 redef class AAssignOp
764 fun method_name
: Symbol is abstract
766 redef class APlusAssignOp
767 redef fun method_name
do return once
"+".to_symbol
769 redef class AMinusAssignOp
770 redef fun method_name
do return once
"-".to_symbol
773 redef class ASelfExpr
774 var _variable
: nullable ParamVariable
775 redef fun variable
do return _variable
.as(not null)
777 redef fun its_variable
do return variable
779 redef fun after_typing
(v
)
781 _variable
= v
.self_var
782 _stype
= v
.variable_ctx
.stype
(variable
)
786 redef fun is_self
do return true
789 redef class AImplicitSelfExpr
790 redef fun is_implicit_self
do return true
793 redef class AIfexprExpr
794 redef fun accept_typing
(v
)
796 var old_var_ctx
= v
.variable_ctx
799 v
.enter_visit
(n_expr
)
800 v
.check_conform_expr
(n_expr
, v
.type_bool
)
802 # Prepare 'then' context
803 v
.use_if_true_variable_ctx
(n_expr
)
806 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
)
807 v
.enter_visit
(n_then
)
809 # Remember what appened in the 'then'
810 var then_var_ctx
= v
.variable_ctx
812 # Prepare 'else' context
813 v
.variable_ctx
= old_var_ctx
814 v
.use_if_false_variable_ctx
(n_expr
)
817 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
)
818 v
.enter_visit
(n_else
)
820 # Merge 'then' and 'else' contexts
821 v
.variable_ctx
= old_var_ctx
.merge_reash
(self, then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
823 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
824 if stype
== null then return
831 redef class ABoolExpr
832 redef fun after_typing
(v
)
840 redef fun accept_typing
(v
)
842 var old_var_ctx
= v
.variable_ctx
843 var stype
= v
.type_bool
846 # Process left operand
847 v
.enter_visit
(n_expr
)
849 # Prepare right operand context
850 v
.use_if_false_variable_ctx
(n_expr
)
852 # Process right operand
853 v
.enter_visit
(n_expr2
)
854 if n_expr2
.if_false_variable_ctx
!= null then
855 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
857 _if_false_variable_ctx
= v
.variable_ctx
860 v
.variable_ctx
= old_var_ctx
862 v
.check_conform_expr
(n_expr
, stype
)
863 v
.check_conform_expr
(n_expr2
, stype
)
870 redef fun accept_typing
(v
)
872 var old_var_ctx
= v
.variable_ctx
873 var stype
= v
.type_bool
875 # Process left operand
876 v
.enter_visit
(n_expr
)
878 # Prepare right operand context
879 v
.use_if_true_variable_ctx
(n_expr
)
881 # Process right operand
882 v
.enter_visit
(n_expr2
)
883 if n_expr2
.if_true_variable_ctx
!= null then
884 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
886 _if_true_variable_ctx
= v
.variable_ctx
889 v
.variable_ctx
= old_var_ctx
891 v
.check_conform_expr
(n_expr
, stype
)
892 v
.check_conform_expr
(n_expr2
, stype
)
899 redef fun after_typing
(v
)
901 v
.check_conform_expr
(n_expr
, v
.type_bool
)
903 # Invert if_true/if_false information
904 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
905 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
913 redef fun after_typing
(v
)
920 redef class AFloatExpr
921 redef fun after_typing
(v
)
923 _stype
= v
.type_float
928 redef class ACharExpr
929 redef fun after_typing
(v
)
936 redef class AStringFormExpr
937 redef fun after_typing
(v
)
939 _stype
= v
.type_string
944 redef class ASuperstringExpr
945 redef fun atype
do return _atype
.as(not null)
946 var _atype
: nullable MMType
947 redef fun after_typing
(v
)
949 var stype
= v
.type_string
951 var atype
= v
.type_array
(stype
)
957 redef class ANullExpr
958 redef fun after_typing
(v
)
965 redef class AArrayExpr
966 redef fun after_typing
(v
)
968 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
969 if stype
!= null then do_typing
(v
, stype
)
972 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
974 _stype
= v
.type_array
(element_type
)
979 redef class ARangeExpr
980 redef fun after_typing
(v
)
982 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
983 var ntype
= n_expr
.stype
984 var ntype2
= n_expr2
.stype
985 if ntype
< ntype2
then
987 else if not ntype2
< ntype
then
988 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
991 var dtype
= v
.type_discrete
992 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
993 _stype
= v
.type_range
(ntype
)
998 redef class ASuperExpr
999 redef readable var _init_in_superclass
: nullable MMMethod
1000 redef fun compute_raw_arguments
do return n_args
.to_a
1001 redef fun after_typing
(v
)
1003 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
1004 if not precs
.is_empty
then
1005 v
.local_property
.need_super
= true
1006 else if v
.local_property
.global
.is_init
then
1007 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
1008 for p
in base_precs
do
1009 if not p
.global
.is_init
then
1010 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
1012 precs
.add
(v
.local_class
[p
.global
])
1015 if precs
.is_empty
then
1016 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
1018 else if precs
.length
> 1 then
1019 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
1022 var p
= base_precs
.first
1023 assert p
isa MMMethod
1024 _init_in_superclass
= p
1025 register_super_init_call
(v
, p
)
1026 if n_args
.length
> 0 then
1027 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
1028 process_signature
(v
, signature
, p
.name
, compute_raw_arguments
)
1031 v
.error
(self, "Error: No super method to call for {v.local_property}.")
1035 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
1036 var stypes
= new Array[MMType]
1037 var stype
: nullable MMType = null
1038 for prop
in precs
do
1039 assert prop
isa MMMethod
1040 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
)
1042 if stype
== null or stype
< t
then
1047 v
.check_conform
(self, t
, stype
.as(not null))
1051 var p
= v
.local_property
1052 assert p
isa MMSrcMethod
1058 redef class AAttrFormExpr
1059 redef fun prop
do return _prop
.as(not null)
1060 var _prop
: nullable MMAttribute
1062 redef fun attr_type
do return _attr_type
.as(not null)
1063 var _attr_type
: nullable MMType
1065 # Compute the attribute accessed
1066 private fun do_typing
(v
: TypingVisitor)
1068 if not v
.check_expr
(n_expr
) then return
1069 var type_recv
= n_expr
.stype
1070 var name
= n_id
.to_symbol
1071 if type_recv
isa MMTypeNone then
1072 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1075 var lc
= type_recv
.local_class
1076 if not lc
.has_global_property_by_name
(name
) then
1077 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1080 var prop
= lc
.select_attribute
(name
)
1081 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1082 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1085 var at
= prop
.signature_for
(type_recv
).return_type
1086 if not n_expr
.is_self
then at
= at
.not_for_self
1091 redef class AAttrExpr
1092 redef fun after_typing
(v
)
1095 if _prop
== null then return
1101 redef class AAttrAssignExpr
1102 redef fun after_typing
(v
)
1105 if _prop
== null then return
1106 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1111 redef class AAttrReassignExpr
1112 redef fun after_typing
(v
)
1115 if _prop
== null then return
1116 var t
= do_rvalue_typing
(v
, attr_type
)
1117 if t
== null then return
1118 v
.check_conform
(self, t
, n_value
.stype
)
1123 redef class AIssetAttrExpr
1124 redef fun after_typing
(v
)
1127 if _prop
== null then return
1128 if attr_type
.is_nullable
then
1129 v
.error
(self, "Error: isset on a nullable attribute.")
1131 _stype
= v
.type_bool
1136 redef class AAbsAbsSendExpr
1137 # The signature of the called property
1138 redef fun prop_signature
do return _prop_signature
.as(not null)
1139 var _prop_signature
: nullable MMSignature
1141 # Raw arguments used (without vararg transformation)
1142 redef fun raw_arguments
: Array[AExpr]
1144 var res
= _raw_arguments_cache
1148 res
= compute_raw_arguments
1149 if res
== null then res
= new Array[AExpr]
1150 _raw_arguments_cache
= res
1155 var _raw_arguments_cache
: nullable Array[AExpr] = null
1157 fun compute_raw_arguments
: nullable Array[AExpr]
1159 print
"{location} no compute_raw_arguments"
1163 # Check the conformity of a set of arguments `raw_args' to a signature.
1164 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): Bool
1166 var par_vararg
= psig
.vararg_rank
1167 var par_arity
= psig
.arity
1169 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1170 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1171 v
.error
(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
1175 for par_idx
in [0..par_arity
[ do
1177 var par_type
= psig
[par_idx
]
1178 if par_idx
== par_vararg
then
1179 for i
in [0..(raw_arity-par_arity
)] do
1180 a
= raw_args
[arg_idx
]
1181 v
.check_conform_expr
(a
, par_type
)
1182 arg_idx
= arg_idx
+ 1
1185 a
= raw_args
[arg_idx
]
1186 v
.check_conform_expr
(a
, par_type
)
1187 arg_idx
= arg_idx
+ 1
1193 # Check the conformity of a set of defined closures
1194 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1196 var t
= psig
.return_type
1197 var cs
= psig
.closures
# Declared closures
1200 if not c
.is_optional
then min_arity
+= 1
1203 if cd
!= null then arity
= cd
.length
1204 if cs
.length
> 0 then
1205 if arity
== 0 and min_arity
> 0 then
1206 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1207 else if arity
> cs
.length
or arity
< min_arity
then
1208 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1210 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1211 var break_list
: nullable Array[ABreakExpr] = null
1212 if t
!= null then break_list
= new Array[ABreakExpr]
1214 # The n_label, is any in only set on the last decl
1215 var n_label
= if arity
> 0 then cd
[arity-1
].n_label
else null
1217 # Process each closure definition
1218 for i
in [0..arity
[ do
1220 var cni
= cdi
.n_id
.to_symbol
1221 var csi
= psig
.closure_named
(cni
)
1223 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1224 v
.escapable_ctx
.push
(esc
, n_label
)
1225 cdi
.accept_typing2
(v
, esc
)
1227 else if cs
.length
== 1 then
1228 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
1230 var a
= new Array[String]
1234 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
1238 # Check break type conformity
1239 if break_list
!= null then
1240 t
= v
.check_conform_multiexpr
(t
, break_list
)
1243 else if arity
!= 0 then
1244 v
.error
(self, "Error: {name} does not require blocks.")
1250 redef class AAbsSendExpr
1251 # Compute the called global property
1252 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])
1254 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1255 if prop
== null then return
1256 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1257 if not process_signature
(v
, sig
, prop
.name
, raw_args
) then return
1258 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1259 if rtype
== null and sig
.return_type
!= null then return
1261 _prop_signature
= sig
1262 _return_type
= rtype
1265 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1267 if type_recv
isa MMTypeNone then
1268 if name
== (once
"==".to_symbol
) or name
== (once
"!=".to_symbol
) then
1269 # Special case on != and == that are allowed for 'null'
1270 type_recv
= v
.type_object
.as_nullable
1272 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1276 var lc
= type_recv
.local_class
1277 var prop
: nullable MMMethod = null
1278 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1279 if prop
== null and v
.local_property
.global
.is_init
then
1280 var props
= lc
.super_methods_named
(name
)
1281 if props
.length
> 1 then
1282 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1284 else if props
.length
== 1 then
1285 var p
= lc
[props
.first
.global
]
1286 assert p
isa MMMethod
1291 if prop
== null then
1292 if is_implicit_self
then
1293 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1295 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1302 # Get the signature for a local property and a receiver
1303 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1305 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1306 var psig
= prop
.signature_for
(type_recv
)
1307 if not recv_is_self
then psig
= psig
.not_for_self
1311 # The invoked method (once computed)
1312 redef fun prop
do return _prop
.as(not null)
1313 var _prop
: nullable MMMethod
1315 # The return type (if any) (once computed)
1316 redef readable var _return_type
: nullable MMType
1319 # A possible call of constructor in a super class
1320 # Could be an explicit call or with the 'super' keyword
1321 redef class ASuperInitCall
1322 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1324 if parent
!= v
.top_block
and self != v
.top_block
then
1325 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1327 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1328 var prev_class
: nullable MMLocalClass = null
1329 var esic
= v
.explicit_super_init_calls
.as(not null)
1330 if not esic
.is_empty
then
1331 prev_class
= esic
.last
.global
.intro
.local_class
1333 var order
= v
.local_class
.cshe
.reverse_linear_extension
1334 if cla
== v
.local_class
then
1335 v
.explicit_other_init_call
= true
1336 else if not order
.has
(cla
) then
1337 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1338 else if cla
== prev_class
then
1339 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1342 if c
== prev_class
then
1344 else if c
== cla
then
1345 if prev_class
!= null then
1346 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1357 redef class ANewExpr
1358 redef fun compute_raw_arguments
do return n_args
.to_a
1359 redef fun after_typing
(v
)
1361 if not n_type
.is_typed
then return
1362 var t
= n_type
.stype
1363 if t
.local_class
.global
.is_abstract
then
1364 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1368 if n_id
== null then
1369 name
= once
"init".to_symbol
1371 name
= n_id
.to_symbol
1374 do_typing
(v
, t
, false, false, name
, raw_arguments
, null)
1375 if _prop
== null then return
1377 if not prop
.global
.is_init
then
1378 v
.error
(self, "Error: {prop} is not a constructor.")
1387 redef class ASendExpr
1388 # Name of the invoked property
1389 fun name
: Symbol is abstract
1391 # Closure definitions
1392 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1394 redef fun after_typing
(v
)
1399 private fun do_all_typing
(v
: TypingVisitor)
1401 if not v
.check_expr
(n_expr
) then return
1402 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1403 if _prop
== null then return
1404 var prop
= _prop
.as(not null)
1406 if prop
.global
.is_init
then
1407 if not v
.local_property
.global
.is_init
then
1408 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1409 else if not n_expr
.is_self
then
1410 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1412 register_super_init_call
(v
, prop
)
1416 _stype
= return_type
1421 redef class ASendReassignExpr
1422 redef fun read_prop
do return _read_prop
.as(not null)
1423 var _read_prop
: nullable MMMethod
1424 redef fun do_all_typing
(v
)
1426 if not v
.check_expr
(n_expr
) then return
1427 var raw_args
= raw_arguments
1428 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1430 if prop
== null then return
1431 if prop
.global
.is_init
then
1432 if not v
.local_property
.global
.is_init
then
1433 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1434 else if not n_expr
.is_self
then
1435 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1438 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1439 if not n_expr
.is_self
then t
= t
.not_for_self
1441 var t2
= do_rvalue_typing
(v
, t
)
1442 if t2
== null then return
1443 v
.check_conform
(self, t2
, n_value
.stype
)
1446 raw_args
= raw_args
.to_a
1447 raw_args
.add
(n_value
)
1449 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1450 if prop
.global
.is_init
then
1451 if not v
.local_property
.global
.is_init
then
1452 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1453 else if not n_expr
.is_self
then
1454 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1462 redef class ABinopExpr
1463 redef fun compute_raw_arguments
do return [n_expr2
]
1466 redef fun name
do return once
"==".to_symbol
1467 redef fun after_typing
(v
)
1470 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1471 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1472 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1473 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1476 if n_expr
.stype
isa MMTypeNone then
1477 if n_expr2
.stype
isa MMTypeNone then
1478 v
.warning
(self, "Warning: comparaison between 2 null values.")
1480 try_to_isa
(v
, n_expr2
)
1482 else if n_expr2
.stype
isa MMTypeNone then
1483 try_to_isa
(v
, n_expr
)
1487 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1489 var variable
= n
.its_variable
1490 if variable
!= null and n
.stype
isa MMNullableType then
1491 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1492 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, v
.type_none
)
1497 redef fun name
do return once
"!=".to_symbol
1498 redef fun after_typing
(v
)
1501 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1502 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1503 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1504 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1507 if n_expr
.stype
isa MMTypeNone then
1508 if n_expr2
.stype
isa MMTypeNone then
1509 v
.warning
(self, "Warning: comparaison between 2 null values.")
1511 try_to_isa
(v
, n_expr2
)
1513 else if n_expr2
.stype
isa MMTypeNone then
1514 try_to_isa
(v
, n_expr
)
1518 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1520 var variable
= n
.its_variable
1521 if variable
!= null and n
.stype
isa MMNullableType then
1522 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1523 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, v
.type_none
)
1528 redef fun name
do return once
"<".to_symbol
1531 redef fun name
do return once
"<=".to_symbol
1534 redef fun name
do return once
">".to_symbol
1537 redef fun name
do return once
">=".to_symbol
1539 redef class APlusExpr
1540 redef fun name
do return once
"+".to_symbol
1542 redef class AMinusExpr
1543 redef fun name
do return once
"-".to_symbol
1545 redef class AStarshipExpr
1546 redef fun name
do return once
"<=>".to_symbol
1548 redef class AStarExpr
1549 redef fun name
do return once
"*".to_symbol
1551 redef class ASlashExpr
1552 redef fun name
do return once
"/".to_symbol
1554 redef class APercentExpr
1555 redef fun name
do return once
"%".to_symbol
1558 redef class AUminusExpr
1559 redef fun name
do return once
"unary -".to_symbol
1560 redef fun compute_raw_arguments
do return null
1563 redef class ACallFormExpr
1564 redef fun after_typing
(v
)
1566 if n_expr
.is_implicit_self
then
1567 var name
= n_id
.to_symbol
1568 var variable
= v
.variable_ctx
[name
]
1569 if variable
!= null then
1571 if variable
isa ClosureVariable then
1572 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1573 n
._variable
= variable
1575 if not n_args
.is_empty
then
1576 v
.error
(self, "Error: {name} is variable, not a function.")
1579 n
= variable_create
(variable
)
1580 n
._variable
= variable
1591 redef fun closure_defs
1593 if n_closure_defs
.is_empty
then
1596 return n_closure_defs
.to_a
1600 # Create a variable acces corresponding to the call form
1601 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1604 redef class ACallExpr
1605 redef fun variable_create
(variable
)
1607 return new AVarExpr.init_avarexpr
(n_id
)
1610 redef fun name
do return n_id
.to_symbol
1611 redef fun compute_raw_arguments
do return n_args
.to_a
1614 redef class ACallAssignExpr
1615 redef fun variable_create
(variable
)
1617 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1620 redef fun name
do return (n_id
.text
+ "=").to_symbol
1621 redef fun compute_raw_arguments
do
1622 var res
= n_args
.to_a
1628 redef class ACallReassignExpr
1629 redef fun variable_create
(variable
)
1631 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1634 redef fun name
do return n_id
.to_symbol
1635 redef fun compute_raw_arguments
do return n_args
.to_a
1638 redef class ABraExpr
1639 redef fun name
do return once
"[]".to_symbol
1640 redef fun compute_raw_arguments
do return n_args
.to_a
1641 redef fun closure_defs
1643 if n_closure_defs
.is_empty
then
1646 return n_closure_defs
.to_a
1651 redef class ABraAssignExpr
1652 redef fun name
do return once
"[]=".to_symbol
1653 redef fun compute_raw_arguments
do
1654 var res
= n_args
.to_a
1660 redef class ABraReassignExpr
1661 redef fun name
do return once
"[]".to_symbol
1662 redef fun compute_raw_arguments
do return n_args
.to_a
1665 redef class AInitExpr
1666 redef fun name
do return once
"init".to_symbol
1667 redef fun compute_raw_arguments
do return n_args
.to_a
1670 redef class AClosureCallExpr
1671 var _variable
: nullable ClosureVariable
1672 redef fun variable
do return _variable
.as(not null)
1673 redef fun compute_raw_arguments
do return n_args
.to_a
1675 redef fun after_typing
(v
)
1678 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1679 var sig
= va
.closure
.signature
1680 var s
= process_signature
(v
, sig
, n_id
.to_symbol
, compute_raw_arguments
)
1681 if not n_closure_defs
.is_empty
then
1682 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1684 if not s
then return
1685 _prop_signature
= sig
1686 _stype
= sig
.return_type
1691 redef class AClosureId
1692 fun to_symbol
: Symbol is abstract
1694 redef class ASimpleClosureId
1695 redef fun to_symbol
: Symbol do return n_id
.to_symbol
1697 redef class ABreakClosureId
1698 redef fun to_symbol
: Symbol do return n_kwbreak
.to_symbol
1701 redef class AClosureDef
1702 var _closure
: nullable MMClosure
1703 redef fun closure
do return _closure
.as(not null)
1705 # The corresponding escapable object
1706 readable var _escapable
: nullable EscapableBlock
1708 var _accept_typing2
: Bool = false
1709 redef fun accept_typing
(v
)
1711 # Typing is deferred, wait accept_typing2(v)
1712 if _accept_typing2
then super
1715 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1719 var sig
= esc
.closure
.signature
1720 if sig
.arity
!= n_ids
.length
then
1721 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
1725 _closure
= esc
.closure
1727 var old_var_ctx
= v
.variable_ctx
1728 var old_base_var_ctx
= v
.base_variable_ctx
1729 v
.base_variable_ctx
= v
.variable_ctx
1730 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1731 variables
= new Array[AutoVariable]
1732 for i
in [0..n_ids
.length
[ do
1733 var va
= new AutoVariable(n_ids
[i
].to_symbol
, n_ids
[i
])
1736 v
.variable_ctx
.add
(va
)
1739 _accept_typing2
= true
1742 if v
.variable_ctx
.unreash
== false then
1743 if closure
.signature
.return_type
!= null then
1744 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1745 else if closure
.is_break
and esc
.break_list
!= null then
1746 v
.error
(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
1749 v
.variable_ctx
= old_var_ctx
1750 v
.base_variable_ctx
= old_base_var_ctx
1754 class ATypeCheckExpr
1756 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1758 if not v
.check_expr
(n_expr
) then return
1759 if not n_type
.is_typed
then return
1760 var etype
= n_expr
.stype
1761 var ttype
= n_type
.stype
1762 if etype
== ttype
then
1763 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1764 else if etype
< ttype
then
1765 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1766 else if etype
isa MMTypeNone then
1767 # ttype is not nullable because of prevous test
1768 v
.warning
(self, "Warning: Expression is null therefore cannot be a {ttype}.")
1769 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1770 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1771 # No warning in this case since with
1772 # type T: nullable A
1774 # 'x.as(not null)' != 'x.as(T)'
1775 # 'x != null' != 'x isa T'
1776 else if self isa AIsaExpr then
1777 v
.warning
(self, "Warning: Prefer '!= null'.")
1779 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1785 redef class AIsaExpr
1786 special ATypeCheckExpr
1787 redef fun after_typing
(v
)
1789 check_expr_cast
(v
, n_expr
, n_type
)
1790 if not n_type
.is_typed
then return
1791 var variable
= n_expr
.its_variable
1792 if variable
!= null then
1793 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1795 _stype
= v
.type_bool
1800 redef class AAsCastExpr
1801 special ATypeCheckExpr
1802 redef fun after_typing
(v
)
1804 check_expr_cast
(v
, n_expr
, n_type
)
1805 if not n_type
.is_typed
then return
1806 _stype
= n_type
.stype
1807 _is_typed
= _stype
!= null
1811 redef class AAsNotnullExpr
1812 redef fun after_typing
(v
)
1814 if not v
.check_expr
(n_expr
) then return
1815 var t
= n_expr
.stype
1816 if t
isa MMTypeNone then
1817 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1819 else if not t
.is_nullable
then
1820 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1822 _stype
= n_expr
.stype
.as_notnull
1827 redef class AProxyExpr
1828 redef fun after_typing
(v
)
1830 if not n_expr
.is_typed
then return
1832 if n_expr
.is_statement
then return
1833 _stype
= n_expr
.stype
1837 redef class AOnceExpr
1838 redef fun accept_typing
(v
)
1840 if v
.once_count
> 0 then
1841 v
.warning
(self, "Useless once in a once expression.")
1843 v
.once_count
= v
.once_count
+ 1
1847 v
.once_count
= v
.once_count
- 1