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 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
)
383 var old_var_ctx
= v
.variable_ctx
384 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
387 if not v
.variable_ctx
.unreash
then
389 else if not v
.variable_ctx
.already_unreash
then
390 v
.variable_ctx
.already_unreash
= true
391 v
.error
(e
, "Error: unreachable statement.")
395 v
.variable_ctx
= old_var_ctx
.merge_reash
(self, v
.variable_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
400 redef class AReturnExpr
401 redef fun after_typing
(v
)
403 v
.variable_ctx
.unreash
= true
404 var t
= v
.local_property
.signature
.return_type
406 if e
== null and t
!= null then
407 v
.error
(self, "Error: Return without value in a function.")
408 else if e
!= null and t
== null then
409 v
.error
(self, "Error: Return with value in a procedure.")
410 else if e
!= null and t
!= null then
411 v
.check_conform_expr
(e
, t
)
417 redef class AContinueExpr
418 redef fun after_typing
(v
)
420 v
.variable_ctx
.unreash
= true
421 var esc
= compute_escapable_block
(v
.escapable_ctx
)
422 if esc
== null then return
424 if esc
.is_break_block
then
425 v
.error
(self, "Error: cannot 'continue', only 'break'.")
429 var t
= esc
.continue_stype
430 if n_expr
== null and t
!= null then
431 v
.error
(self, "Error: continue with a value required in this block.")
432 else if n_expr
!= null and t
== null then
433 v
.error
(self, "Error: continue without value required in this block.")
434 else if n_expr
!= null and t
!= null then
435 v
.check_conform_expr
(n_expr
.as(not null), t
)
441 redef class ABreakExpr
442 redef fun after_typing
(v
)
444 var unreash
= v
.variable_ctx
.unreash
445 v
.variable_ctx
.unreash
= true
446 var esc
= compute_escapable_block
(v
.escapable_ctx
)
447 if esc
== null then return
449 if not unreash
then esc
.break_variable_contexts
.add
(v
.variable_ctx
)
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
)
481 var old_var_ctx
= v
.variable_ctx
485 # Add the end of the block as an exit context
486 if not v
.variable_ctx
.unreash
then
487 escapable
.break_variable_contexts
.add
(v
.variable_ctx
)
490 # Merge all exit contexts
491 if not escapable
.break_variable_contexts
.is_empty
then
492 v
.variable_ctx
= old_var_ctx
.merge
(self, escapable
.break_variable_contexts
, v
.base_variable_ctx
)
501 redef fun accept_typing
(v
)
503 var old_var_ctx
= v
.variable_ctx
504 v
.enter_visit
(n_expr
)
505 v
.check_conform_expr
(n_expr
, v
.type_bool
)
507 # Prepare 'then' context
508 v
.use_if_true_variable_ctx
(n_expr
)
511 if n_then
!= null then
512 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
513 v
.enter_visit
(n_then
)
516 # Remember what appened in the 'then'
517 var then_var_ctx
= v
.variable_ctx
519 # Prepare 'else' context
520 v
.variable_ctx
= old_var_ctx
521 v
.use_if_false_variable_ctx
(n_expr
)
524 if n_else
!= null then
525 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
526 v
.enter_visit
(n_else
)
529 # Merge 'then' and 'else' contexts
530 v
.variable_ctx
= old_var_ctx
.merge_reash
(self, then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
535 redef class AWhileExpr
536 # The corresponding escapable block
537 readable var _escapable
: nullable EscapableBlock
539 redef fun accept_typing
(v
)
541 var escapable
= new EscapableBlock(self)
542 _escapable
= escapable
543 v
.escapable_ctx
.push
(escapable
, n_label
)
544 var old_var_ctx
= v
.variable_ctx
545 var old_base_var_ctx
= v
.base_variable_ctx
546 v
.base_variable_ctx
= v
.variable_ctx
549 v
.enter_visit
(n_expr
)
550 v
.check_conform_expr
(n_expr
, v
.type_bool
)
552 if n_expr
isa ATrueExpr then
553 v
.warning
(self, "Warning: use 'loop' instead of 'while true do'.")
556 # Prepare inside context (assert cond)
557 v
.use_if_true_variable_ctx
(n_expr
)
560 if n_block
!= null then
561 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
562 v
.enter_visit
(n_block
)
565 # Compute outside context (assert !cond + all breaks)
566 v
.variable_ctx
= old_var_ctx
567 v
.use_if_false_variable_ctx
(n_expr
)
568 escapable
.break_variable_contexts
.add
(v
.variable_ctx
)
569 v
.variable_ctx
= old_var_ctx
.merge
(self, escapable
.break_variable_contexts
, v
.base_variable_ctx
)
571 v
.base_variable_ctx
= old_base_var_ctx
577 redef class ALoopExpr
578 # The corresponding escapable block
579 readable var _escapable
: nullable EscapableBlock
581 redef fun accept_typing
(v
)
583 var escapable
= new EscapableBlock(self)
584 _escapable
= escapable
585 v
.escapable_ctx
.push
(escapable
, n_label
)
586 var old_var_ctx
= v
.variable_ctx
587 var old_base_var_ctx
= v
.base_variable_ctx
588 v
.base_variable_ctx
= v
.variable_ctx
591 if n_block
!= null then
592 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
593 v
.enter_visit
(n_block
)
596 # Compute outside context (assert all breaks)
597 if escapable
.break_variable_contexts
.is_empty
then
598 old_var_ctx
.unreash
= true
599 v
.variable_ctx
= old_var_ctx
601 v
.variable_ctx
= old_var_ctx
.merge
(self, escapable
.break_variable_contexts
, v
.base_variable_ctx
)
604 v
.base_variable_ctx
= old_base_var_ctx
611 var _variable
: nullable AutoVariable
612 redef fun variable
do return _variable
.as(not null)
614 # The corresponding escapable block
615 readable var _escapable
: nullable EscapableBlock
617 redef fun accept_typing
(v
)
619 var escapable
= new EscapableBlock(self)
620 _escapable
= escapable
621 v
.escapable_ctx
.push
(escapable
, n_label
)
623 var old_var_ctx
= v
.variable_ctx
624 var old_base_var_ctx
= v
.base_variable_ctx
625 v
.base_variable_ctx
= v
.variable_ctx
626 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
627 var va
= new AutoVariable(n_id
.to_symbol
, n_id
)
629 v
.variable_ctx
.add
(va
)
632 v
.enter_visit
(n_expr
)
634 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then
635 v
.variable_ctx
= old_var_ctx
636 v
.base_variable_ctx
= old_base_var_ctx
640 var expr_type
= n_expr
.stype
643 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
644 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
645 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
646 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
647 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
651 if n_block
!= null then v
.enter_visit
(n_block
)
654 v
.variable_ctx
= old_var_ctx
655 v
.base_variable_ctx
= old_base_var_ctx
661 redef class AAssertExpr
662 redef fun accept_typing
(v
)
665 v
.enter_visit
(n_expr
)
666 v
.check_conform_expr
(n_expr
, v
.type_bool
)
668 # Process optional 'else' part
669 if n_else
!= null then
670 var old_var_ctx
= v
.variable_ctx
671 v
.use_if_false_variable_ctx
(n_expr
)
672 v
.enter_visit
(n_else
)
673 v
.variable_ctx
= old_var_ctx
677 v
.use_if_true_variable_ctx
(n_expr
)
682 redef class AVarFormExpr
683 var _variable
: nullable Variable
684 redef fun variable
do return _variable
.as(not null)
688 redef fun its_variable
do return variable
690 redef fun after_typing
(v
)
692 v
.variable_ctx
.check_is_set
(self, variable
)
693 _stype
= v
.variable_ctx
.stype
(variable
)
694 _is_typed
= _stype
!= null
698 redef class AVarAssignExpr
699 redef fun after_typing
(v
)
701 v
.variable_ctx
.mark_is_set
(variable
)
703 # Check the base type
704 var btype
= v
.base_variable_ctx
.stype
(variable
)
705 if not v
.check_expr
(n_value
) then return
706 if btype
!= null and not v
.check_conform_expr
(n_value
, btype
) then return
709 v
.variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_value
.stype
)
715 redef class AReassignFormExpr
716 # Compute and check method used through the reassigment operator
717 # On success return the static type of the result of the reassigment operator
718 # Else display an error and return null
719 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
721 if type_lvalue
== null then
724 var name
= n_assign_op
.method_name
725 if type_lvalue
isa MMTypeNone then
726 v
.error
(self, "Error: Method '{name}' call on 'null'.")
729 var lc
= type_lvalue
.local_class
730 if not lc
.has_global_property_by_name
(name
) then
731 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
734 var prop
= lc
.select_method
(name
)
735 prop
.global
.check_visibility
(v
, self, v
.module, false)
736 var psig
= prop
.signature_for
(type_lvalue
)
737 _assign_method
= prop
738 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
739 return psig
.return_type
.not_for_self
742 redef fun assign_method
do return _assign_method
.as(not null)
743 var _assign_method
: nullable MMMethod
746 redef class AVarReassignExpr
747 redef fun after_typing
(v
)
749 v
.variable_ctx
.check_is_set
(self, variable
)
750 v
.variable_ctx
.mark_is_set
(variable
)
751 var t
= v
.variable_ctx
.stype
(variable
)
752 var t2
= do_rvalue_typing
(v
, t
)
753 if t2
== null then return
755 # Check the base type
756 var btype
= v
.base_variable_ctx
.stype
(variable
)
757 if not v
.check_expr
(n_value
) then return
758 if btype
!= null and not v
.check_conform
(n_value
, t2
, btype
) then return
761 v
.variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, t2
)
767 redef class AAssignOp
768 fun method_name
: Symbol is abstract
770 redef class APlusAssignOp
771 redef fun method_name
do return once
"+".to_symbol
773 redef class AMinusAssignOp
774 redef fun method_name
do return once
"-".to_symbol
777 redef class ASelfExpr
778 var _variable
: nullable ParamVariable
779 redef fun variable
do return _variable
.as(not null)
781 redef fun its_variable
do return variable
783 redef fun after_typing
(v
)
785 _variable
= v
.self_var
786 _stype
= v
.variable_ctx
.stype
(variable
)
790 redef fun is_self
do return true
793 redef class AImplicitSelfExpr
794 redef fun is_implicit_self
do return true
797 redef class AIfexprExpr
798 redef fun accept_typing
(v
)
800 var old_var_ctx
= v
.variable_ctx
803 v
.enter_visit
(n_expr
)
804 v
.check_conform_expr
(n_expr
, v
.type_bool
)
806 # Prepare 'then' context
807 v
.use_if_true_variable_ctx
(n_expr
)
810 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
)
811 v
.enter_visit
(n_then
)
813 # Remember what appened in the 'then'
814 var then_var_ctx
= v
.variable_ctx
816 # Prepare 'else' context
817 v
.variable_ctx
= old_var_ctx
818 v
.use_if_false_variable_ctx
(n_expr
)
821 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
)
822 v
.enter_visit
(n_else
)
824 # Merge 'then' and 'else' contexts
825 v
.variable_ctx
= old_var_ctx
.merge_reash
(self, then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
827 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
828 if stype
== null then return
835 redef class ABoolExpr
836 redef fun after_typing
(v
)
844 redef fun accept_typing
(v
)
846 var old_var_ctx
= v
.variable_ctx
847 var stype
= v
.type_bool
850 # Process left operand
851 v
.enter_visit
(n_expr
)
853 # Prepare right operand context
854 v
.use_if_false_variable_ctx
(n_expr
)
856 # Process right operand
857 v
.enter_visit
(n_expr2
)
858 if n_expr2
.if_false_variable_ctx
!= null then
859 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
861 _if_false_variable_ctx
= v
.variable_ctx
864 v
.variable_ctx
= old_var_ctx
866 v
.check_conform_expr
(n_expr
, stype
)
867 v
.check_conform_expr
(n_expr2
, stype
)
874 redef fun accept_typing
(v
)
876 var old_var_ctx
= v
.variable_ctx
877 var stype
= v
.type_bool
879 # Process left operand
880 v
.enter_visit
(n_expr
)
882 # Prepare right operand context
883 v
.use_if_true_variable_ctx
(n_expr
)
885 # Process right operand
886 v
.enter_visit
(n_expr2
)
887 if n_expr2
.if_true_variable_ctx
!= null then
888 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
890 _if_true_variable_ctx
= v
.variable_ctx
893 v
.variable_ctx
= old_var_ctx
895 v
.check_conform_expr
(n_expr
, stype
)
896 v
.check_conform_expr
(n_expr2
, stype
)
903 redef fun after_typing
(v
)
905 v
.check_conform_expr
(n_expr
, v
.type_bool
)
907 # Invert if_true/if_false information
908 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
909 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
917 redef fun after_typing
(v
)
924 redef class AFloatExpr
925 redef fun after_typing
(v
)
927 _stype
= v
.type_float
932 redef class ACharExpr
933 redef fun after_typing
(v
)
940 redef class AStringFormExpr
941 redef fun after_typing
(v
)
943 _stype
= v
.type_string
948 redef class ASuperstringExpr
949 redef fun atype
do return _atype
.as(not null)
950 var _atype
: nullable MMType
951 redef fun after_typing
(v
)
953 var stype
= v
.type_string
955 var atype
= v
.type_array
(stype
)
961 redef class ANullExpr
962 redef fun after_typing
(v
)
969 redef class AArrayExpr
970 redef fun after_typing
(v
)
972 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
973 if stype
!= null then do_typing
(v
, stype
)
976 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
978 _stype
= v
.type_array
(element_type
)
983 redef class ARangeExpr
984 redef fun after_typing
(v
)
986 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
987 var ntype
= n_expr
.stype
988 var ntype2
= n_expr2
.stype
989 if ntype
< ntype2
then
991 else if not ntype2
< ntype
then
992 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
995 var dtype
= v
.type_discrete
996 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
997 _stype
= v
.type_range
(ntype
)
1002 redef class ASuperExpr
1003 redef readable var _init_in_superclass
: nullable MMMethod
1004 redef fun compute_raw_arguments
do return n_args
.to_a
1005 redef fun after_typing
(v
)
1007 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
1008 if not precs
.is_empty
then
1009 v
.local_property
.need_super
= true
1010 else if v
.local_property
.global
.is_init
then
1011 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
1012 for p
in base_precs
do
1013 if not p
.global
.is_init
then
1014 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
1016 precs
.add
(v
.local_class
[p
.global
])
1019 if precs
.is_empty
then
1020 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
1022 else if precs
.length
> 1 then
1023 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
1026 var p
= base_precs
.first
1027 assert p
isa MMMethod
1028 _init_in_superclass
= p
1029 register_super_init_call
(v
, p
)
1030 if n_args
.length
> 0 then
1031 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
1032 process_signature
(v
, signature
, p
.name
, compute_raw_arguments
)
1035 v
.error
(self, "Error: No super method to call for {v.local_property}.")
1039 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
1040 var stypes
= new Array[MMType]
1041 var stype
: nullable MMType = null
1042 for prop
in precs
do
1043 assert prop
isa MMMethod
1044 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
)
1046 if stype
== null or stype
< t
then
1051 v
.check_conform
(self, t
, stype
.as(not null))
1055 var p
= v
.local_property
1056 assert p
isa MMSrcMethod
1062 redef class AAttrFormExpr
1063 redef fun prop
do return _prop
.as(not null)
1064 var _prop
: nullable MMAttribute
1066 redef fun attr_type
do return _attr_type
.as(not null)
1067 var _attr_type
: nullable MMType
1069 # Compute the attribute accessed
1070 private fun do_typing
(v
: TypingVisitor)
1072 if not v
.check_expr
(n_expr
) then return
1073 var type_recv
= n_expr
.stype
1074 var name
= n_id
.to_symbol
1075 if type_recv
isa MMTypeNone then
1076 v
.error
(self, "Error: Attribute '{name}' access on 'null'.")
1079 var lc
= type_recv
.local_class
1080 if not lc
.has_global_property_by_name
(name
) then
1081 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
1084 var prop
= lc
.select_attribute
(name
)
1085 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
1086 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
1089 var at
= prop
.signature_for
(type_recv
).return_type
1090 if not n_expr
.is_self
then at
= at
.not_for_self
1095 redef class AAttrExpr
1096 redef fun after_typing
(v
)
1099 if _prop
== null then return
1105 redef class AAttrAssignExpr
1106 redef fun after_typing
(v
)
1109 if _prop
== null then return
1110 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1115 redef class AAttrReassignExpr
1116 redef fun after_typing
(v
)
1119 if _prop
== null then return
1120 var t
= do_rvalue_typing
(v
, attr_type
)
1121 if t
== null then return
1122 v
.check_conform
(self, t
, n_value
.stype
)
1127 redef class AIssetAttrExpr
1128 redef fun after_typing
(v
)
1131 if _prop
== null then return
1132 if attr_type
.is_nullable
then
1133 v
.error
(self, "Error: isset on a nullable attribute.")
1135 _stype
= v
.type_bool
1140 redef class AAbsAbsSendExpr
1141 # The signature of the called property
1142 redef fun prop_signature
do return _prop_signature
.as(not null)
1143 var _prop_signature
: nullable MMSignature
1145 # Raw arguments used (without vararg transformation)
1146 redef fun raw_arguments
: Array[AExpr]
1148 var res
= _raw_arguments_cache
1152 res
= compute_raw_arguments
1153 if res
== null then res
= new Array[AExpr]
1154 _raw_arguments_cache
= res
1159 var _raw_arguments_cache
: nullable Array[AExpr] = null
1161 fun compute_raw_arguments
: nullable Array[AExpr]
1163 print
"{location} no compute_raw_arguments"
1167 # Check the conformity of a set of arguments `raw_args' to a signature.
1168 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): Bool
1170 var par_vararg
= psig
.vararg_rank
1171 var par_arity
= psig
.arity
1173 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1174 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1175 v
.error
(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
1179 for par_idx
in [0..par_arity
[ do
1181 var par_type
= psig
[par_idx
]
1182 if par_idx
== par_vararg
then
1183 for i
in [0..(raw_arity-par_arity
)] do
1184 a
= raw_args
[arg_idx
]
1185 v
.check_conform_expr
(a
, par_type
)
1186 arg_idx
= arg_idx
+ 1
1189 a
= raw_args
[arg_idx
]
1190 v
.check_conform_expr
(a
, par_type
)
1191 arg_idx
= arg_idx
+ 1
1197 # Check the conformity of a set of defined closures
1198 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1200 var t
= psig
.return_type
1201 var cs
= psig
.closures
# Declared closures
1204 if not c
.is_optional
then min_arity
+= 1
1207 if cd
!= null then arity
= cd
.length
1208 if cs
.length
> 0 then
1209 if arity
== 0 and min_arity
> 0 then
1210 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1211 else if arity
> cs
.length
or arity
< min_arity
then
1212 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1214 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1215 var break_list
: nullable Array[ABreakExpr] = null
1216 if t
!= null then break_list
= new Array[ABreakExpr]
1218 # The n_label, is any in only set on the last decl
1219 var n_label
= if arity
> 0 then cd
[arity-1
].n_label
else null
1221 # Process each closure definition
1222 for i
in [0..arity
[ do
1224 var cni
= cdi
.n_id
.to_symbol
1225 var csi
= psig
.closure_named
(cni
)
1227 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1228 v
.escapable_ctx
.push
(esc
, n_label
)
1229 cdi
.accept_typing2
(v
, esc
)
1231 else if cs
.length
== 1 then
1232 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
1234 var a
= new Array[String]
1238 v
.error
(cdi
.n_id
, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
1242 # Check break type conformity
1243 if break_list
!= null then
1244 t
= v
.check_conform_multiexpr
(t
, break_list
)
1247 else if arity
!= 0 then
1248 v
.error
(self, "Error: {name} does not require blocks.")
1254 redef class AAbsSendExpr
1255 # Compute the called global property
1256 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])
1258 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1259 if prop
== null then return
1260 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1261 if not process_signature
(v
, sig
, prop
.name
, raw_args
) then return
1262 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1263 if rtype
== null and sig
.return_type
!= null then return
1265 _prop_signature
= sig
1266 _return_type
= rtype
1269 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1271 if type_recv
isa MMTypeNone then
1272 if name
== (once
"==".to_symbol
) or name
== (once
"!=".to_symbol
) then
1273 # Special case on != and == that are allowed for 'null'
1274 type_recv
= v
.type_object
.as_nullable
1276 v
.error
(self, "Error: Method '{name}' call on 'null'.")
1280 var lc
= type_recv
.local_class
1281 var prop
: nullable MMMethod = null
1282 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1283 if prop
== null and v
.local_property
.global
.is_init
then
1284 var props
= lc
.super_methods_named
(name
)
1285 if props
.length
> 1 then
1286 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1288 else if props
.length
== 1 then
1289 var p
= lc
[props
.first
.global
]
1290 assert p
isa MMMethod
1295 if prop
== null then
1296 if is_implicit_self
then
1297 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1299 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1306 # Get the signature for a local property and a receiver
1307 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1309 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1310 var psig
= prop
.signature_for
(type_recv
)
1311 if not recv_is_self
then psig
= psig
.not_for_self
1315 # The invoked method (once computed)
1316 redef fun prop
do return _prop
.as(not null)
1317 var _prop
: nullable MMMethod
1319 # The return type (if any) (once computed)
1320 redef readable var _return_type
: nullable MMType
1323 # A possible call of constructor in a super class
1324 # Could be an explicit call or with the 'super' keyword
1325 redef class ASuperInitCall
1326 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1328 if parent
!= v
.top_block
and self != v
.top_block
then
1329 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1331 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1332 var prev_class
: nullable MMLocalClass = null
1333 var esic
= v
.explicit_super_init_calls
.as(not null)
1334 if not esic
.is_empty
then
1335 prev_class
= esic
.last
.global
.intro
.local_class
1337 var order
= v
.local_class
.cshe
.reverse_linear_extension
1338 if cla
== v
.local_class
then
1339 v
.explicit_other_init_call
= true
1340 else if not order
.has
(cla
) then
1341 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1342 else if cla
== prev_class
then
1343 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1345 var last_is_found
= prev_class
== null
1347 if c
== prev_class
then
1348 last_is_found
= true
1349 else if c
== cla
then
1350 if not last_is_found
then
1351 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1362 redef class ANewExpr
1363 redef fun compute_raw_arguments
do return n_args
.to_a
1364 redef fun after_typing
(v
)
1366 if not n_type
.is_typed
then return
1367 var t
= n_type
.stype
1368 if t
.local_class
.global
.is_abstract
then
1369 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1373 if n_id
== null then
1374 name
= once
"init".to_symbol
1376 name
= n_id
.to_symbol
1379 do_typing
(v
, t
, false, false, name
, raw_arguments
, null)
1380 if _prop
== null then return
1382 if not prop
.global
.is_init
then
1383 v
.error
(self, "Error: {prop} is not a constructor.")
1392 redef class ASendExpr
1393 # Name of the invoked property
1394 fun name
: Symbol is abstract
1396 # Closure definitions
1397 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1399 redef fun after_typing
(v
)
1404 private fun do_all_typing
(v
: TypingVisitor)
1406 if not v
.check_expr
(n_expr
) then return
1407 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1408 if _prop
== null then return
1409 var prop
= _prop
.as(not null)
1411 if prop
.global
.is_init
then
1412 if not v
.local_property
.global
.is_init
then
1413 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1414 else if not n_expr
.is_self
then
1415 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1417 register_super_init_call
(v
, prop
)
1421 _stype
= return_type
1426 redef class ASendReassignExpr
1427 redef fun read_prop
do return _read_prop
.as(not null)
1428 var _read_prop
: nullable MMMethod
1429 redef fun do_all_typing
(v
)
1431 if not v
.check_expr
(n_expr
) then return
1432 var raw_args
= raw_arguments
1433 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1435 if prop
== null then return
1436 if prop
.global
.is_init
then
1437 if not v
.local_property
.global
.is_init
then
1438 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1439 else if not n_expr
.is_self
then
1440 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1443 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1444 if not n_expr
.is_self
then t
= t
.not_for_self
1446 var t2
= do_rvalue_typing
(v
, t
)
1447 if t2
== null then return
1448 v
.check_conform
(self, t2
, n_value
.stype
)
1451 raw_args
= raw_args
.to_a
1452 raw_args
.add
(n_value
)
1454 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1455 if prop
.global
.is_init
then
1456 if not v
.local_property
.global
.is_init
then
1457 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1458 else if not n_expr
.is_self
then
1459 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1467 redef class ABinopExpr
1468 redef fun compute_raw_arguments
do return [n_expr2
]
1471 redef fun name
do return once
"==".to_symbol
1472 redef fun after_typing
(v
)
1475 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1476 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1477 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1478 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1481 if n_expr
.stype
isa MMTypeNone then
1482 if n_expr2
.stype
isa MMTypeNone then
1483 v
.warning
(self, "Warning: comparaison between 2 null values.")
1485 try_to_isa
(v
, n_expr2
)
1487 else if n_expr2
.stype
isa MMTypeNone then
1488 try_to_isa
(v
, n_expr
)
1492 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1494 var variable
= n
.its_variable
1495 if variable
!= null and n
.stype
isa MMNullableType then
1496 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1497 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, v
.type_none
)
1502 redef fun name
do return once
"!=".to_symbol
1503 redef fun after_typing
(v
)
1506 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1507 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1508 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1509 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1512 if n_expr
.stype
isa MMTypeNone then
1513 if n_expr2
.stype
isa MMTypeNone then
1514 v
.warning
(self, "Warning: comparaison between 2 null values.")
1516 try_to_isa
(v
, n_expr2
)
1518 else if n_expr2
.stype
isa MMTypeNone then
1519 try_to_isa
(v
, n_expr
)
1523 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1525 var variable
= n
.its_variable
1526 if variable
!= null and n
.stype
isa MMNullableType then
1527 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1528 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, v
.type_none
)
1533 redef fun name
do return once
"<".to_symbol
1536 redef fun name
do return once
"<=".to_symbol
1539 redef fun name
do return once
">".to_symbol
1542 redef fun name
do return once
">=".to_symbol
1544 redef class APlusExpr
1545 redef fun name
do return once
"+".to_symbol
1547 redef class AMinusExpr
1548 redef fun name
do return once
"-".to_symbol
1550 redef class AStarshipExpr
1551 redef fun name
do return once
"<=>".to_symbol
1553 redef class AStarExpr
1554 redef fun name
do return once
"*".to_symbol
1556 redef class ASlashExpr
1557 redef fun name
do return once
"/".to_symbol
1559 redef class APercentExpr
1560 redef fun name
do return once
"%".to_symbol
1563 redef class AUminusExpr
1564 redef fun name
do return once
"unary -".to_symbol
1565 redef fun compute_raw_arguments
do return null
1568 redef class ACallFormExpr
1569 redef fun after_typing
(v
)
1571 if n_expr
.is_implicit_self
then
1572 var name
= n_id
.to_symbol
1573 var variable
= v
.variable_ctx
[name
]
1574 if variable
!= null then
1576 if variable
isa ClosureVariable then
1577 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1578 n
._variable
= variable
1580 if not n_args
.is_empty
then
1581 v
.error
(self, "Error: {name} is variable, not a function.")
1584 n
= variable_create
(variable
)
1585 n
._variable
= variable
1596 redef fun closure_defs
1598 if n_closure_defs
.is_empty
then
1601 return n_closure_defs
.to_a
1605 # Create a variable acces corresponding to the call form
1606 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1609 redef class ACallExpr
1610 redef fun variable_create
(variable
)
1612 return new AVarExpr.init_avarexpr
(n_id
)
1615 redef fun name
do return n_id
.to_symbol
1616 redef fun compute_raw_arguments
do return n_args
.to_a
1619 redef class ACallAssignExpr
1620 redef fun variable_create
(variable
)
1622 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1625 redef fun name
do return (n_id
.text
+ "=").to_symbol
1626 redef fun compute_raw_arguments
do
1627 var res
= n_args
.to_a
1633 redef class ACallReassignExpr
1634 redef fun variable_create
(variable
)
1636 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1639 redef fun name
do return n_id
.to_symbol
1640 redef fun compute_raw_arguments
do return n_args
.to_a
1643 redef class ABraExpr
1644 redef fun name
do return once
"[]".to_symbol
1645 redef fun compute_raw_arguments
do return n_args
.to_a
1646 redef fun closure_defs
1648 if n_closure_defs
.is_empty
then
1651 return n_closure_defs
.to_a
1656 redef class ABraAssignExpr
1657 redef fun name
do return once
"[]=".to_symbol
1658 redef fun compute_raw_arguments
do
1659 var res
= n_args
.to_a
1665 redef class ABraReassignExpr
1666 redef fun name
do return once
"[]".to_symbol
1667 redef fun compute_raw_arguments
do return n_args
.to_a
1670 redef class AInitExpr
1671 redef fun name
do return once
"init".to_symbol
1672 redef fun compute_raw_arguments
do return n_args
.to_a
1675 redef class AClosureCallExpr
1676 var _variable
: nullable ClosureVariable
1677 redef fun variable
do return _variable
.as(not null)
1678 redef fun compute_raw_arguments
do return n_args
.to_a
1680 redef fun after_typing
(v
)
1683 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1684 var sig
= va
.closure
.signature
1685 var s
= process_signature
(v
, sig
, n_id
.to_symbol
, compute_raw_arguments
)
1686 if not n_closure_defs
.is_empty
then
1687 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1689 if not s
then return
1690 _prop_signature
= sig
1691 _stype
= sig
.return_type
1696 redef class AClosureId
1697 fun to_symbol
: Symbol is abstract
1699 redef class ASimpleClosureId
1700 redef fun to_symbol
: Symbol do return n_id
.to_symbol
1702 redef class ABreakClosureId
1703 redef fun to_symbol
: Symbol do return n_kwbreak
.to_symbol
1706 redef class AClosureDef
1707 var _closure
: nullable MMClosure
1708 redef fun closure
do return _closure
.as(not null)
1710 # The corresponding escapable object
1711 readable var _escapable
: nullable EscapableBlock
1713 var _accept_typing2
: Bool = false
1714 redef fun accept_typing
(v
)
1716 # Typing is deferred, wait accept_typing2(v)
1717 if _accept_typing2
then super
1720 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1724 var sig
= esc
.closure
.signature
1725 if sig
.arity
!= n_ids
.length
then
1726 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
1730 _closure
= esc
.closure
1732 var old_var_ctx
= v
.variable_ctx
1733 var old_base_var_ctx
= v
.base_variable_ctx
1734 v
.base_variable_ctx
= v
.variable_ctx
1735 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1736 variables
= new Array[AutoVariable]
1737 for i
in [0..n_ids
.length
[ do
1738 var va
= new AutoVariable(n_ids
[i
].to_symbol
, n_ids
[i
])
1741 v
.variable_ctx
.add
(va
)
1744 _accept_typing2
= true
1747 if v
.variable_ctx
.unreash
== false then
1748 if closure
.signature
.return_type
!= null then
1749 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1750 else if closure
.is_break
and esc
.break_list
!= null then
1751 v
.error
(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
1754 v
.variable_ctx
= old_var_ctx
1755 v
.base_variable_ctx
= old_base_var_ctx
1759 class ATypeCheckExpr
1761 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1763 if not v
.check_expr
(n_expr
) then return
1764 if not n_type
.is_typed
then return
1765 var etype
= n_expr
.stype
1766 var ttype
= n_type
.stype
1767 if etype
== ttype
then
1768 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1769 else if etype
< ttype
then
1770 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1771 else if etype
isa MMTypeNone then
1772 # ttype is not nullable because of prevous test
1773 v
.warning
(self, "Warning: Expression is null therefore cannot be a {ttype}.")
1774 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1775 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1776 # No warning in this case since with
1777 # type T: nullable A
1779 # 'x.as(not null)' != 'x.as(T)'
1780 # 'x != null' != 'x isa T'
1781 else if self isa AIsaExpr then
1782 v
.warning
(self, "Warning: Prefer '!= null'.")
1784 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1790 redef class AIsaExpr
1791 special ATypeCheckExpr
1792 redef fun after_typing
(v
)
1794 check_expr_cast
(v
, n_expr
, n_type
)
1795 if not n_type
.is_typed
then return
1796 var variable
= n_expr
.its_variable
1797 if variable
!= null then
1798 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1800 _stype
= v
.type_bool
1805 redef class AAsCastExpr
1806 special ATypeCheckExpr
1807 redef fun after_typing
(v
)
1809 check_expr_cast
(v
, n_expr
, n_type
)
1810 if not n_type
.is_typed
then return
1811 _stype
= n_type
.stype
1812 _is_typed
= _stype
!= null
1816 redef class AAsNotnullExpr
1817 redef fun after_typing
(v
)
1819 if not v
.check_expr
(n_expr
) then return
1820 var t
= n_expr
.stype
1821 if t
isa MMTypeNone then
1822 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1824 else if not t
.is_nullable
then
1825 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1827 _stype
= n_expr
.stype
.as_notnull
1832 redef class AProxyExpr
1833 redef fun after_typing
(v
)
1835 if not n_expr
.is_typed
then return
1837 if n_expr
.is_statement
then return
1838 _stype
= n_expr
.stype
1842 redef class AOnceExpr
1843 redef fun accept_typing
(v
)
1845 if v
.once_count
> 0 then
1846 v
.warning
(self, "Useless once in a once expression.")
1848 v
.once_count
= v
.once_count
+ 1
1852 v
.once_count
= v
.once_count
- 1