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 escapable
= new EscapableClosure(self, variable
.closure
, null)
275 _escapable
= escapable
276 v
.escapable_ctx
.push
(escapable
)
280 if n_expr
!= null then
281 if v
.variable_ctx
.unreash
== false then
282 if variable
.closure
.signature
.return_type
!= null then
283 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
284 else if variable
.closure
.is_break
then
285 v
.error
(self, "Control error: Reached end of break block (an 'abort' was expected).")
290 old_var_ctx
.merge
(v
.variable_ctx
)
291 v
.variable_ctx
= old_var_ctx
292 v
.base_variable_ctx
= old_base_var_ctx
298 redef fun stype
: MMType do return _stype
.as(not null)
299 redef fun is_typed
: Bool do return _stype
!= null
300 var _stype
: nullable MMType
302 redef fun after_typing
(v
)
304 _stype
= get_stype
(v
)
309 redef readable var _is_typed
: Bool = false
310 redef fun is_statement
: Bool do return _stype
== null
314 print
"{location}: not is_typed"
318 print
"{location}: is_statement"
321 return _stype
.as(not null)
323 var _stype
: nullable MMType
325 redef fun after_typing
(v
)
327 # Default behavior is to be happy
331 # Is the expression the implicit receiver
332 fun is_implicit_self
: Bool do return false
334 # Is the expression the current receiver (implicit or explicit)
335 fun is_self
: Bool do return false
337 # The variable accessed is any
338 fun its_variable
: nullable Variable do return null
340 # The variable type information if current boolean expression is true
341 readable private var _if_true_variable_ctx
: nullable VariableContext
343 # The variable type information if current boolean expression is false
344 readable private var _if_false_variable_ctx
: nullable VariableContext
347 redef class AVardeclExpr
348 var _variable
: nullable VarVariable
349 redef fun variable
do return _variable
.as(not null)
351 redef fun after_typing
(v
)
353 var va
= new VarVariable(n_id
.to_symbol
, self)
355 v
.variable_ctx
.add
(va
)
356 if n_expr
!= null then v
.variable_ctx
.mark_is_set
(va
)
358 if n_type
!= null then
359 if not n_type
.is_typed
then return
360 va
.stype
= n_type
.stype
361 if n_expr
!= null then
362 v
.check_conform_expr
(n_expr
.as(not null), va
.stype
)
365 if not v
.check_expr
(n_expr
.as(not null)) then return
366 va
.stype
= n_expr
.stype
372 redef class ABlockExpr
373 redef fun accept_typing
(v
)
375 var old_var_ctx
= v
.variable_ctx
376 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
379 if v
.variable_ctx
.unreash
and not v
.variable_ctx
.already_unreash
then
380 v
.variable_ctx
.already_unreash
= true
381 v
.warning
(e
, "Warning: unreachable statement.")
386 old_var_ctx
.merge
(v
.variable_ctx
)
387 v
.variable_ctx
= old_var_ctx
392 redef class AReturnExpr
393 redef fun after_typing
(v
)
395 v
.variable_ctx
.unreash
= true
396 var t
= v
.local_property
.signature
.return_type
398 if e
== null and t
!= null then
399 v
.error
(self, "Error: Return without value in a function.")
400 else if e
!= null and t
== null then
401 v
.error
(self, "Error: Return with value in a procedure.")
402 else if e
!= null and t
!= null then
403 v
.check_conform_expr
(e
, t
)
409 redef class AContinueExpr
410 redef fun after_typing
(v
)
412 v
.variable_ctx
.unreash
= true
413 var esc
= compute_escapable_block
(v
.escapable_ctx
)
414 if esc
== null then return
416 if esc
.is_break_block
then
417 v
.error
(self, "Error: 'continue' forbiden in break blocks.")
421 var t
= esc
.continue_stype
422 if n_expr
== null and t
!= null then
423 v
.error
(self, "Error: continue with a value required in this block.")
424 else if n_expr
!= null and t
== null then
425 v
.error
(self, "Error: continue without value required in this block.")
426 else if n_expr
!= null and t
!= null then
427 v
.check_conform_expr
(n_expr
.as(not null), t
)
433 redef class ABreakExpr
434 redef fun after_typing
(v
)
436 v
.variable_ctx
.unreash
= true
437 var esc
= compute_escapable_block
(v
.escapable_ctx
)
438 if esc
== null then return
440 var bl
= esc
.break_list
441 if n_expr
== null and bl
!= null then
442 v
.error
(self, "Error: break with a value required in this block.")
443 else if n_expr
!= null and bl
== null then
444 v
.error
(self, "Error: break without value required in this block.")
445 else if n_expr
!= null and bl
!= null then
446 # Typing check can only be done later
447 bl
.add
(n_expr
.as(not null))
453 redef class AAbortExpr
454 redef fun after_typing
(v
)
456 v
.variable_ctx
.unreash
= true
462 redef fun accept_typing
(v
)
464 var old_var_ctx
= v
.variable_ctx
465 v
.enter_visit
(n_expr
)
466 v
.check_conform_expr
(n_expr
, v
.type_bool
)
468 # Prepare 'then' context
469 v
.use_if_true_variable_ctx
(n_expr
)
472 if n_then
!= null then
473 v
.variable_ctx
= v
.variable_ctx
.sub
(n_then
.as(not null))
474 v
.enter_visit
(n_then
)
477 # Remember what appened in the 'then'
478 var then_var_ctx
= v
.variable_ctx
480 # Prepare 'else' context
481 v
.variable_ctx
= old_var_ctx
482 v
.use_if_false_variable_ctx
(n_expr
)
485 if n_else
!= null then
486 v
.variable_ctx
= v
.variable_ctx
.sub
(n_else
.as(not null))
487 v
.enter_visit
(n_else
)
490 # Merge 'then' and 'else' contexts
491 old_var_ctx
.merge2
(then_var_ctx
, v
.variable_ctx
, v
.base_variable_ctx
)
492 v
.variable_ctx
= old_var_ctx
497 redef class AWhileExpr
498 # The corresponding escapable block
499 readable var _escapable
: nullable EscapableBlock
501 redef fun accept_typing
(v
)
503 var escapable
= new EscapableBlock(self)
504 _escapable
= escapable
505 v
.escapable_ctx
.push
(escapable
)
506 var old_var_ctx
= v
.variable_ctx
507 var old_base_var_ctx
= v
.base_variable_ctx
508 v
.base_variable_ctx
= v
.variable_ctx
509 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
512 v
.enter_visit
(n_expr
)
513 v
.check_conform_expr
(n_expr
, v
.type_bool
)
515 # Prepare inside context (assert cond)
516 v
.use_if_true_variable_ctx
(n_expr
)
519 if n_block
!= null then
520 v
.variable_ctx
= v
.variable_ctx
.sub
(n_block
.as(not null))
521 v
.enter_visit
(n_block
)
524 v
.variable_ctx
= old_var_ctx
525 v
.base_variable_ctx
= old_base_var_ctx
532 var _variable
: nullable AutoVariable
533 redef fun variable
do return _variable
.as(not null)
535 # The corresponding escapable block
536 readable var _escapable
: nullable EscapableBlock
538 redef fun accept_typing
(v
)
540 var escapable
= new EscapableBlock(self)
541 _escapable
= escapable
542 v
.escapable_ctx
.push
(escapable
)
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
547 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
548 var va
= new AutoVariable(n_id
.to_symbol
, self)
550 v
.variable_ctx
.add
(va
)
553 v
.enter_visit
(n_expr
)
555 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then return
556 var expr_type
= n_expr
.stype
559 var meth_iterator
= v
.get_method
(expr_type
, once
"iterator".to_symbol
)
560 var iter_type
= meth_iterator
.signature_for
(expr_type
).return_type
.as(not null)
561 var meth_item
= v
.get_method
(iter_type
, once
("item".to_symbol
))
562 var va_stype
= meth_item
.signature_for
(iter_type
).return_type
.as(not null)
563 if not n_expr
.is_self
then va_stype
= va_stype
.not_for_self
567 if n_block
!= null then v
.enter_visit
(n_block
)
570 v
.variable_ctx
= old_var_ctx
571 v
.base_variable_ctx
= old_base_var_ctx
577 redef class AAssertExpr
578 redef fun after_typing
(v
)
580 v
.check_conform_expr
(n_expr
, v
.type_bool
)
581 v
.use_if_true_variable_ctx
(n_expr
)
586 redef class AVarFormExpr
587 var _variable
: nullable Variable
588 redef fun variable
do return _variable
.as(not null)
592 redef fun its_variable
do return variable
594 redef fun after_typing
(v
)
596 v
.variable_ctx
.check_is_set
(self, variable
)
597 _stype
= v
.variable_ctx
.stype
(variable
)
598 _is_typed
= _stype
!= null
602 redef class AVarAssignExpr
603 redef fun after_typing
(v
)
605 v
.variable_ctx
.mark_is_set
(variable
)
606 var t
= v
.variable_ctx
.stype
(variable
)
608 # Check the base type
609 var btype
= v
.base_variable_ctx
.stype
(variable
)
610 if not v
.check_conform_expr
(n_value
, btype
) then return
613 v
.variable_ctx
.stype
(variable
) = n_value
.stype
619 redef class AReassignFormExpr
620 # Compute and check method used through the reassigment operator
621 # On success return the static type of the result of the reassigment operator
622 # Else display an error and return null
623 private fun do_rvalue_typing
(v
: TypingVisitor, type_lvalue
: nullable MMType): nullable MMType
625 if type_lvalue
== null then
628 var name
= n_assign_op
.method_name
629 var lc
= type_lvalue
.local_class
630 if not lc
.has_global_property_by_name
(name
) then
631 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
634 var prop
= lc
.select_method
(name
)
635 prop
.global
.check_visibility
(v
, self, v
.module, false)
636 var psig
= prop
.signature_for
(type_lvalue
)
637 _assign_method
= prop
638 if not v
.check_conform_expr
(n_value
, psig
[0].not_for_self
) then return null
639 return psig
.return_type
.not_for_self
642 redef fun assign_method
do return _assign_method
.as(not null)
643 var _assign_method
: nullable MMMethod
646 redef class AVarReassignExpr
647 redef fun after_typing
(v
)
649 v
.variable_ctx
.check_is_set
(self, variable
)
650 v
.variable_ctx
.mark_is_set
(variable
)
651 var t
= v
.variable_ctx
.stype
(variable
)
652 var t2
= do_rvalue_typing
(v
, t
)
653 if t2
== null then return
655 # Check the base type
656 var btype
= v
.base_variable_ctx
.stype
(variable
)
657 if not v
.check_conform
(n_value
, t2
, btype
) then return
660 v
.variable_ctx
.stype
(variable
) = t2
666 redef class AAssignOp
667 fun method_name
: Symbol is abstract
669 redef class APlusAssignOp
670 redef fun method_name
do return once
"+".to_symbol
672 redef class AMinusAssignOp
673 redef fun method_name
do return once
"-".to_symbol
676 redef class ASelfExpr
677 var _variable
: nullable ParamVariable
678 redef fun variable
do return _variable
.as(not null)
680 redef fun its_variable
do return variable
682 redef fun after_typing
(v
)
684 _variable
= v
.self_var
685 _stype
= v
.variable_ctx
.stype
(variable
)
689 redef fun is_self
do return true
692 redef class AImplicitSelfExpr
693 redef fun is_implicit_self
do return true
696 redef class AIfexprExpr
697 redef fun accept_typing
(v
)
699 var old_var_ctx
= v
.variable_ctx
702 v
.enter_visit
(n_expr
)
703 v
.check_conform_expr
(n_expr
, v
.type_bool
)
705 # Prepare 'then' context
706 v
.use_if_true_variable_ctx
(n_expr
)
709 v
.enter_visit
(n_then
)
711 # Prepare 'else' context
712 v
.variable_ctx
= old_var_ctx
713 v
.use_if_false_variable_ctx
(n_expr
)
716 v
.enter_visit
(n_else
)
718 var stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
719 if stype
== null then return
726 redef class ABoolExpr
727 redef fun after_typing
(v
)
735 redef fun accept_typing
(v
)
737 var old_var_ctx
= v
.variable_ctx
738 var stype
= v
.type_bool
741 # Process left operand
742 v
.enter_visit
(n_expr
)
744 # Prepare right operand context
745 v
.use_if_false_variable_ctx
(n_expr
)
747 # Process right operand
748 v
.enter_visit
(n_expr2
)
749 if n_expr2
.if_false_variable_ctx
!= null then
750 _if_false_variable_ctx
= n_expr2
.if_false_variable_ctx
752 _if_false_variable_ctx
= v
.variable_ctx
755 v
.variable_ctx
= old_var_ctx
757 v
.check_conform_expr
(n_expr
, stype
)
758 v
.check_conform_expr
(n_expr2
, stype
)
765 redef fun accept_typing
(v
)
767 var old_var_ctx
= v
.variable_ctx
768 var stype
= v
.type_bool
770 # Process left operand
771 v
.enter_visit
(n_expr
)
773 # Prepare right operand context
774 v
.use_if_true_variable_ctx
(n_expr
)
776 # Process right operand
777 v
.enter_visit
(n_expr2
)
778 if n_expr2
.if_true_variable_ctx
!= null then
779 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
781 _if_true_variable_ctx
= v
.variable_ctx
784 v
.variable_ctx
= old_var_ctx
786 v
.check_conform_expr
(n_expr
, stype
)
787 v
.check_conform_expr
(n_expr2
, stype
)
794 redef fun after_typing
(v
)
796 v
.check_conform_expr
(n_expr
, v
.type_bool
)
798 # Invert if_true/if_false information
799 _if_false_variable_ctx
= n_expr
._if_true_variable_ctx
800 _if_true_variable_ctx
= n_expr
._if_false_variable_ctx
808 redef fun after_typing
(v
)
815 redef class AFloatExpr
816 redef fun after_typing
(v
)
818 _stype
= v
.type_float
823 redef class ACharExpr
824 redef fun after_typing
(v
)
831 redef class AStringFormExpr
832 redef fun after_typing
(v
)
834 _stype
= v
.type_string
839 redef class ASuperstringExpr
840 redef fun atype
do return _atype
.as(not null)
841 var _atype
: nullable MMType
842 redef fun after_typing
(v
)
844 var stype
= v
.type_string
846 var atype
= v
.type_array
(stype
)
852 redef class ANullExpr
853 redef fun after_typing
(v
)
860 redef class AArrayExpr
861 redef fun after_typing
(v
)
863 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
864 if stype
!= null then do_typing
(v
, stype
)
867 private fun do_typing
(v
: TypingVisitor, element_type
: MMType)
869 _stype
= v
.type_array
(element_type
)
874 redef class ARangeExpr
875 redef fun after_typing
(v
)
877 if not v
.check_expr
(n_expr
) or not v
.check_expr
(n_expr2
) then return
878 var ntype
= n_expr
.stype
879 var ntype2
= n_expr2
.stype
880 if ntype
< ntype2
then
882 else if not ntype2
< ntype
then
883 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
886 var dtype
= v
.type_discrete
887 if not v
.check_conform_expr
(n_expr
, dtype
) or not v
.check_conform_expr
(n_expr2
, dtype
) then return
888 _stype
= v
.type_range
(ntype
)
893 redef class ASuperExpr
894 redef readable var _init_in_superclass
: nullable MMMethod
895 redef fun after_typing
(v
)
897 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
898 if not precs
.is_empty
then
899 v
.local_property
.need_super
= true
900 else if v
.local_property
.global
.is_init
then
901 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
902 for p
in base_precs
do
903 if not p
.global
.is_init
then
904 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
906 precs
.add
(v
.local_class
[p
.global
])
909 if precs
.is_empty
then
910 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
912 else if precs
.length
> 1 then
913 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
916 var p
= base_precs
.first
917 assert p
isa MMMethod
918 _init_in_superclass
= p
919 register_super_init_call
(v
, p
)
920 if n_args
.length
> 0 then
921 var signature
= get_signature
(v
, v
.self_var
.stype
.as(not null), p
, true)
922 _arguments
= process_signature
(v
, signature
, p
.name
, n_args
.to_a
)
925 v
.error
(self, "Error: No super method to call for {v.local_property}.")
929 if precs
.first
.signature_for
(v
.self_var
.stype
.as(not null)).return_type
!= null then
930 var stypes
= new Array[MMType]
931 var stype
: nullable MMType = null
933 assert prop
isa MMMethod
934 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
)
936 if stype
== null or stype
< t
then
941 v
.check_conform
(self, t
, stype
.as(not null))
945 var p
= v
.local_property
946 assert p
isa MMSrcMethod
952 redef class AAttrFormExpr
953 redef fun prop
do return _prop
.as(not null)
954 var _prop
: nullable MMAttribute
956 redef fun attr_type
do return _attr_type
.as(not null)
957 var _attr_type
: nullable MMType
959 # Compute the attribute accessed
960 private fun do_typing
(v
: TypingVisitor)
962 if not v
.check_expr
(n_expr
) then return
963 var type_recv
= n_expr
.stype
964 var name
= n_id
.to_symbol
965 var lc
= type_recv
.local_class
966 if not lc
.has_global_property_by_name
(name
) then
967 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
970 var prop
= lc
.select_attribute
(name
)
971 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
972 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
975 var at
= prop
.signature_for
(type_recv
).return_type
976 if not n_expr
.is_self
then at
= at
.not_for_self
981 redef class AAttrExpr
982 redef fun after_typing
(v
)
985 if _prop
== null then return
991 redef class AAttrAssignExpr
992 redef fun after_typing
(v
)
995 if _prop
== null then return
996 if not v
.check_conform_expr
(n_value
, attr_type
) then return
1001 redef class AAttrReassignExpr
1002 redef fun after_typing
(v
)
1005 if _prop
== null then return
1006 var t
= do_rvalue_typing
(v
, attr_type
)
1007 if t
== null then return
1008 v
.check_conform
(self, t
, n_value
.stype
)
1013 redef class AIssetAttrExpr
1014 redef fun after_typing
(v
)
1017 if _prop
== null then return
1018 if attr_type
.is_nullable
then
1019 v
.error
(self, "Error: isset on a nullable attribute.")
1021 _stype
= v
.type_bool
1026 redef class AAbsAbsSendExpr
1027 # The signature of the called property
1028 redef fun prop_signature
do return _prop_signature
.as(not null)
1029 var _prop_signature
: nullable MMSignature
1031 # The real arguments used (after star transformation) (once computed)
1032 redef fun arguments
do return _arguments
.as(not null)
1033 var _arguments
: nullable Array[AExpr]
1035 # Check the conformity of a set of arguments `raw_args' to a signature.
1036 private fun process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: nullable Array[AExpr]): nullable Array[AExpr]
1038 var par_vararg
= psig
.vararg_rank
1039 var par_arity
= psig
.arity
1041 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
1042 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
1043 v
.error
(self, "Error: '{name}' arity missmatch.")
1047 var args
= new Array[AExpr]
1048 for par_idx
in [0..par_arity
[ do
1050 var par_type
= psig
[par_idx
]
1051 if par_idx
== par_vararg
then
1052 var star
= new Array[AExpr]
1053 for i
in [0..(raw_arity-par_arity
)] do
1054 a
= raw_args
[arg_idx
]
1055 v
.check_conform_expr
(a
, par_type
)
1057 arg_idx
= arg_idx
+ 1
1059 var aa
= new AArrayExpr.init_aarrayexpr
(star
)
1060 aa
.do_typing
(v
, par_type
)
1063 a
= raw_args
[arg_idx
]
1064 v
.check_conform_expr
(a
, par_type
)
1065 arg_idx
= arg_idx
+ 1
1072 # Check the conformity of a set of defined closures
1073 private fun process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: nullable Array[AClosureDef]): nullable MMType
1075 var t
= psig
.return_type
1076 var cs
= psig
.closures
# Declared closures
1079 if not c
.is_optional
then min_arity
+= 1
1082 if cd
!= null then arity
= cd
.length
1083 if cs
.length
> 0 then
1084 if arity
== 0 and min_arity
> 0 then
1085 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1086 else if arity
> cs
.length
or arity
< min_arity
then
1087 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1089 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1090 var break_list
: nullable Array[ABreakExpr] = null
1091 if t
!= null then break_list
= new Array[ABreakExpr]
1093 # Process each closure definition
1094 for i
in [0..arity
[ do
1097 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1098 v
.escapable_ctx
.push
(esc
)
1099 cdi
.accept_typing2
(v
, esc
)
1103 # Check break type conformity
1104 if break_list
!= null then
1105 t
= v
.check_conform_multiexpr
(t
, break_list
)
1108 else if arity
!= 0 then
1109 v
.error
(self, "Error: {name} does not require blocks.")
1115 redef class AAbsSendExpr
1116 # Compute the called global property
1117 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])
1119 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
1120 if prop
== null then return
1121 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
1122 var args
= process_signature
(v
, sig
, prop
.name
, raw_args
)
1123 if args
== null then return
1124 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
1125 if rtype
== null and sig
.return_type
!= null then return
1127 _prop_signature
= sig
1129 _return_type
= rtype
1132 private fun get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): nullable MMMethod
1134 var lc
= type_recv
.local_class
1135 var prop
: nullable MMMethod = null
1136 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
1137 if prop
== null and v
.local_property
.global
.is_init
then
1138 var props
= type_recv
.local_class
.super_methods_named
(name
)
1139 if props
.length
> 1 then
1140 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
1142 else if props
.length
== 1 then
1143 var p
= type_recv
.local_class
[props
.first
.global
]
1144 assert p
isa MMMethod
1149 if prop
== null then
1150 if is_implicit_self
then
1151 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
1153 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
1160 # Get the signature for a local property and a receiver
1161 private fun get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
1163 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
1164 var psig
= prop
.signature_for
(type_recv
)
1165 if not recv_is_self
then psig
= psig
.not_for_self
1169 # The invoked method (once computed)
1170 redef fun prop
do return _prop
.as(not null)
1171 var _prop
: nullable MMMethod
1173 # The return type (if any) (once computed)
1174 redef readable var _return_type
: nullable MMType
1177 # A possible call of constructor in a super class
1178 # Could be an explicit call or with the 'super' keyword
1179 redef class ASuperInitCall
1180 private fun register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1182 if parent
!= v
.top_block
and self != v
.top_block
then
1183 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1185 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1186 var prev_class
: nullable MMLocalClass = null
1187 var esic
= v
.explicit_super_init_calls
.as(not null)
1188 if not esic
.is_empty
then
1189 prev_class
= esic
.last
.global
.intro
.local_class
1191 var order
= v
.local_class
.cshe
.reverse_linear_extension
1192 if cla
== v
.local_class
then
1193 v
.explicit_other_init_call
= true
1194 else if not order
.has
(cla
) then
1195 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1196 else if cla
== prev_class
then
1197 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1199 var last_is_found
= prev_class
== null
1201 if c
== prev_class
then
1202 last_is_found
= true
1203 else if c
== cla
then
1204 if not last_is_found
then
1205 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1216 redef class ANewExpr
1217 redef fun after_typing
(v
)
1219 if not n_type
.is_typed
then return
1220 var t
= n_type
.stype
1221 if t
.local_class
.global
.is_abstract
then
1222 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1226 if n_id
== null then
1227 name
= once
"init".to_symbol
1229 name
= n_id
.to_symbol
1232 do_typing
(v
, t
, false, false, name
, n_args
.to_a
, null)
1233 if _prop
== null then return
1235 if not prop
.global
.is_init
then
1236 v
.error
(self, "Error: {prop} is not a constructor.")
1245 redef class ASendExpr
1246 # Name of the invoked property
1247 fun name
: Symbol is abstract
1249 # Raw arguments used (withour star transformation)
1250 fun raw_arguments
: nullable Array[AExpr] is abstract
1252 # Closure definitions
1253 redef fun closure_defs
: nullable Array[AClosureDef] do return null
1255 redef fun after_typing
(v
)
1260 private fun do_all_typing
(v
: TypingVisitor)
1262 if not v
.check_expr
(n_expr
) then return
1263 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1264 if _prop
== null then return
1265 var prop
= _prop
.as(not null)
1267 if prop
.global
.is_init
then
1268 if not v
.local_property
.global
.is_init
then
1269 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1270 else if not n_expr
.is_self
then
1271 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1273 register_super_init_call
(v
, prop
)
1277 _stype
= return_type
1282 redef class ASendReassignExpr
1283 redef fun read_prop
do return _read_prop
.as(not null)
1284 var _read_prop
: nullable MMMethod
1285 redef fun do_all_typing
(v
)
1287 if not v
.check_expr
(n_expr
) then return
1288 var raw_args
= raw_arguments
1289 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1291 if prop
== null then return
1292 if prop
.global
.is_init
then
1293 if not v
.local_property
.global
.is_init
then
1294 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1295 else if not n_expr
.is_self
then
1296 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1299 var t
= prop
.signature_for
(n_expr
.stype
).return_type
.as(not null)
1300 if not n_expr
.is_self
then t
= t
.not_for_self
1302 var t2
= do_rvalue_typing
(v
, t
)
1303 if t2
== null then return
1304 v
.check_conform
(self, t2
, n_value
.stype
)
1307 var old_args
= arguments
1308 raw_args
.add
(n_value
)
1310 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1311 if prop
.global
.is_init
then
1312 if not v
.local_property
.global
.is_init
then
1313 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1314 else if not n_expr
.is_self
then
1315 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1319 _arguments
= old_args
# FIXME: What if star parameters do not match betwen the two methods?
1324 redef class ABinopExpr
1325 redef fun raw_arguments
do return [n_expr2
]
1328 redef fun name
do return once
"==".to_symbol
1329 redef fun after_typing
(v
)
1332 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1333 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1334 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1335 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1338 if n_expr
.stype
isa MMTypeNone then
1339 try_to_isa
(v
, n_expr2
)
1340 else if n_expr2
.stype
isa MMTypeNone then
1341 try_to_isa
(v
, n_expr
)
1345 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1347 var variable
= n
.its_variable
1348 if variable
!= null then
1349 _if_false_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1354 redef fun name
do return once
"!=".to_symbol
1355 redef fun after_typing
(v
)
1358 if not n_expr
.is_typed
or not n_expr2
.is_typed
then return
1359 if n_expr
.stype
isa MMTypeNone and not n_expr2
.stype
.is_nullable
or
1360 n_expr2
.stype
isa MMTypeNone and not n_expr
.stype
.is_nullable
then
1361 v
.warning
(self, "Warning: comparaison between null and a non nullable value.")
1364 if n_expr
.stype
isa MMTypeNone then
1365 try_to_isa
(v
, n_expr2
)
1366 else if n_expr2
.stype
isa MMTypeNone then
1367 try_to_isa
(v
, n_expr
)
1371 private fun try_to_isa
(v
: TypingVisitor, n
: AExpr)
1373 var variable
= n
.its_variable
1374 if variable
!= null then
1375 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n
.stype
.as_notnull
)
1380 redef fun name
do return once
"<".to_symbol
1383 redef fun name
do return once
"<=".to_symbol
1386 redef fun name
do return once
">".to_symbol
1389 redef fun name
do return once
">=".to_symbol
1391 redef class APlusExpr
1392 redef fun name
do return once
"+".to_symbol
1394 redef class AMinusExpr
1395 redef fun name
do return once
"-".to_symbol
1397 redef class AStarshipExpr
1398 redef fun name
do return once
"<=>".to_symbol
1400 redef class AStarExpr
1401 redef fun name
do return once
"*".to_symbol
1403 redef class ASlashExpr
1404 redef fun name
do return once
"/".to_symbol
1406 redef class APercentExpr
1407 redef fun name
do return once
"%".to_symbol
1410 redef class AUminusExpr
1411 redef fun name
do return once
"unary -".to_symbol
1412 redef fun raw_arguments
do return null
1415 redef class ACallFormExpr
1416 redef fun after_typing
(v
)
1418 if n_expr
.is_implicit_self
then
1419 var name
= n_id
.to_symbol
1420 var variable
= v
.variable_ctx
[name
]
1421 if variable
!= null then
1423 if variable
isa ClosureVariable then
1424 n
= new AClosureCallExpr.init_aclosurecallexpr
(n_id
, n_args
, n_closure_defs
)
1425 n
._variable
= variable
1427 if not n_args
.is_empty
then
1428 v
.error
(self, "Error: {name} is variable, not a function.")
1431 n
= variable_create
(variable
)
1432 n
._variable
= variable
1443 redef fun closure_defs
1445 if n_closure_defs
.is_empty
then
1448 return n_closure_defs
.to_a
1452 # Create a variable acces corresponding to the call form
1453 fun variable_create
(variable
: Variable): AVarFormExpr is abstract
1456 redef class ACallExpr
1457 redef fun variable_create
(variable
)
1459 return new AVarExpr.init_avarexpr
(n_id
)
1462 redef fun name
do return n_id
.to_symbol
1463 redef fun raw_arguments
do return n_args
.to_a
1466 redef class ACallAssignExpr
1467 redef fun variable_create
(variable
)
1469 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1472 redef fun name
do return (n_id
.text
+ "=").to_symbol
1473 redef fun raw_arguments
do
1474 var res
= n_args
.to_a
1480 redef class ACallReassignExpr
1481 redef fun variable_create
(variable
)
1483 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1486 redef fun name
do return n_id
.to_symbol
1487 redef fun raw_arguments
do return n_args
.to_a
1490 redef class ABraExpr
1491 redef fun name
do return once
"[]".to_symbol
1492 redef fun raw_arguments
do return n_args
.to_a
1495 redef class ABraAssignExpr
1496 redef fun name
do return once
"[]=".to_symbol
1497 redef fun raw_arguments
do
1498 var res
= n_args
.to_a
1504 redef class ABraReassignExpr
1505 redef fun name
do return once
"[]".to_symbol
1506 redef fun raw_arguments
do return n_args
.to_a
1509 redef class AInitExpr
1510 redef fun name
do return once
"init".to_symbol
1511 redef fun raw_arguments
do return n_args
.to_a
1514 redef class AClosureCallExpr
1515 var _variable
: nullable ClosureVariable
1516 redef fun variable
do return _variable
.as(not null)
1518 redef fun after_typing
(v
)
1521 if va
.closure
.is_break
then v
.variable_ctx
.unreash
= true
1522 var sig
= va
.closure
.signature
1523 var args
= process_signature
(v
, sig
, n_id
.to_symbol
, n_args
.to_a
)
1524 if not n_closure_defs
.is_empty
then
1525 process_closures
(v
, sig
, n_id
.to_symbol
, n_closure_defs
.to_a
)
1527 if args
== null then return
1528 _prop_signature
= sig
1530 _stype
= sig
.return_type
1535 redef class AClosureDef
1536 var _closure
: nullable MMClosure
1537 redef fun closure
do return _closure
.as(not null)
1539 # The corresponding escapable object
1540 readable var _escapable
: nullable EscapableBlock
1542 var _accept_typing2
: Bool = false
1543 redef fun accept_typing
(v
)
1545 # Typing is deferred, wait accept_typing2(v)
1546 if _accept_typing2
then super
1549 private fun accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure)
1553 var sig
= esc
.closure
.signature
1554 if sig
.arity
!= n_id
.length
then
1555 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_id.length} found.")
1559 _closure
= esc
.closure
1561 var old_var_ctx
= v
.variable_ctx
1562 var old_base_var_ctx
= v
.base_variable_ctx
1563 v
.base_variable_ctx
= v
.variable_ctx
1564 v
.variable_ctx
= v
.variable_ctx
.sub
(self)
1565 variables
= new Array[AutoVariable]
1566 for i
in [0..n_id
.length
[ do
1567 var va
= new AutoVariable(n_id
[i
].to_symbol
, self)
1570 v
.variable_ctx
.add
(va
)
1573 _accept_typing2
= true
1576 if v
.variable_ctx
.unreash
== false then
1577 if closure
.signature
.return_type
!= null then
1578 v
.error
(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
1579 else if closure
.is_break
then
1580 v
.error
(self, "Control error: Reached end of break block (a 'break' was expected).")
1583 v
.variable_ctx
= old_var_ctx
1584 v
.base_variable_ctx
= old_base_var_ctx
1588 class ATypeCheckExpr
1590 private fun check_expr_cast
(v
: TypingVisitor, n_expr
: AExpr, n_type
: AType)
1592 if not v
.check_expr
(n_expr
) then return
1593 if not n_type
.is_typed
then return
1594 var etype
= n_expr
.stype
1595 var ttype
= n_type
.stype
1596 if etype
== ttype
then
1597 v
.warning
(self, "Warning: Expression is already a {ttype}.")
1598 else if etype
< ttype
then
1599 v
.warning
(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
1600 else if etype
.is_nullable
and etype
.as_notnull
== ttype
then
1601 if ttype
isa MMTypeFormal and ttype
.bound
.is_nullable
then
1602 # No warning in this case since with
1603 # type T: nullable A
1605 # 'x.as(not null)' != 'x.as(T)'
1606 # 'x != null' != 'x isa T'
1607 else if self isa AIsaExpr then
1608 v
.warning
(self, "Warning: Prefer '!= null'.")
1610 v
.warning
(self, "Warning: Prefer '.as(not null)'.")
1616 redef class AIsaExpr
1617 special ATypeCheckExpr
1618 redef fun after_typing
(v
)
1620 check_expr_cast
(v
, n_expr
, n_type
)
1621 if not n_type
.is_typed
then return
1622 var variable
= n_expr
.its_variable
1623 if variable
!= null then
1624 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(self, variable
, n_type
.stype
)
1626 _stype
= v
.type_bool
1631 redef class AAsCastExpr
1632 special ATypeCheckExpr
1633 redef fun after_typing
(v
)
1635 check_expr_cast
(v
, n_expr
, n_type
)
1636 if not n_type
.is_typed
then return
1637 _stype
= n_type
.stype
1638 _is_typed
= _stype
!= null
1642 redef class AAsNotnullExpr
1643 redef fun after_typing
(v
)
1645 if not v
.check_expr
(n_expr
) then return
1646 var t
= n_expr
.stype
1647 if t
isa MMTypeNone then
1648 v
.error
(n_expr
, "Type error: 'as(not null)' on 'null' value.")
1650 else if not t
.is_nullable
then
1651 v
.warning
(n_expr
, "Warning: 'as(not null)' on non nullable type.")
1653 _stype
= n_expr
.stype
.as_notnull
1658 redef class AProxyExpr
1659 redef fun after_typing
(v
)
1661 if not n_expr
.is_typed
then return
1663 if n_expr
.is_statement
then return
1664 _stype
= n_expr
.stype
1668 redef class AOnceExpr
1669 redef fun accept_typing
(v
)
1671 if v
.once_count
> 0 then
1672 v
.warning
(self, "Useless once in a once expression.")
1674 v
.once_count
= v
.once_count
+ 1
1678 v
.once_count
= v
.once_count
- 1