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
23 redef class MMSrcModule
24 # Walk trough the module and type statments and expressions
25 # Require than supermodules are processed
26 meth do_typing
(tc
: ToolContext)
28 var tv
= new TypingVisitor(tc
, self)
34 # * Associate local variables to nodes
35 # * Distinguish method call and local variable access
36 # * Resolve call and attribute access
37 # * Check type conformance
38 private class TypingVisitor
39 special AbsSyntaxVisitor
42 if n
!= null then n
.accept_typing
(self)
45 # Current knowledge about variables names and types
46 readable writable attr _variable_ctx
: VariableContext
48 # Current knowledge about escapable blocks
49 readable writable attr _escapable_ctx
: EscapableContext = new EscapableContext(self)
51 # The current reciever
52 readable writable attr _self_var
: ParamVariable
54 # Block of the current method
55 readable writable attr _top_block
: PExpr
57 # List of explicit invocation of constructors of super-classes
58 readable writable attr _explicit_super_init_calls
: Array[MMMethod]
60 # Is a other constructor of the same class invoked
61 readable writable attr _explicit_other_init_call
: Bool
63 init(tc
, module) do super
65 private meth get_default_constructor_for
(n
: PNode, c
: MMLocalClass, prop
: MMSrcMethod): MMMethod
68 #var prop = v.local_property
69 #assert prop isa MMMethod
70 var candidates
= new Array[MMMethod]
71 var false_candidates
= new Array[MMMethod]
72 var parity
= prop
.signature
.arity
73 for g
in c
.global_properties
do
74 if not g
.is_init_for
(c
) then continue
76 var gps
= gp
.signature_for
(c
.get_type
)
77 assert gp
isa MMSrcMethod
78 var garity
= gps
.arity
79 if prop
!= null and gp
.name
== prop
.name
then
80 if garity
== 0 or (parity
== garity
and prop
.signature
< gps
) then
83 false_candidates
.add
(gp
)
85 else if garity
== 0 and gp
.name
== once
("init".to_symbol
) then
87 false_candidates
.add
(gp
)
89 false_candidates
.add
(gp
)
92 if candidates
.length
== 1 then
93 return candidates
.first
94 else if candidates
.length
> 0 then
95 var a
= new Array[String]
96 for p
in candidates
do
97 a
.add
("{p.full_name}{p.signature}")
99 v
.error
(n
, "Error: Conflicting default constructor to call for {c}: {a.join(", ")}.")
101 else if false_candidates
.length
> 0 then
102 var a
= new Array[String]
103 for p
in false_candidates
do
104 a
.add
("{p.full_name}{p.signature}")
106 v
.error
(n
, "Error: there is no available compatible constrctor in {c}. Discarded candidates are {a.join(", ")}.")
109 v
.error
(n
, "Error: there is no available compatible constrctor in {c}.")
115 # Associate symbols to variable and variables to type
117 private class VariableContext
118 # Look for the variable from its name
119 # Return null if nothing found
120 meth
[](s
: Symbol): Variable
122 if _dico
.has_key
(s
) then
129 # Register a new variable with its name
130 meth add
(v
: Variable)
136 # The effective static type of a given variable
137 # May be different from the declaration static type
138 meth stype
(v
: Variable): MMType
143 # Variables by name (in the current context only)
144 attr _dico
: Map[Symbol, Variable]
146 # Build a new VariableContext
147 meth sub
: SubVariableContext
149 return new SubVariableContext.with_prev
(self, null, null)
152 # Build a nested VariableContext with new variable information
153 meth sub_with
(v
: Variable, t
: MMType): SubVariableContext
155 return new SubVariableContext.with_prev
(self, v
, t
)
160 _dico
= new HashMap[Symbol, Variable]
164 private class SubVariableContext
165 special VariableContext
166 readable attr _prev
: VariableContext
167 attr _variable
: Variable
168 attr _var_type
: MMType
172 if _dico
.has_key
(s
) then
181 if _variable
== v
then
187 init with_prev
(p
: VariableContext, v
: Variable, t
: MMType)
196 ###############################################################################
199 private meth accept_typing
(v
: TypingVisitor)
201 accept_abs_syntax_visitor
(v
)
204 private meth after_typing
(v
: TypingVisitor) do end
207 redef class PClassdef
208 redef meth accept_typing
(v
)
210 v
.self_var
= new ParamVariable("self".to_symbol
, self)
211 v
.self_var
.stype
= local_class
.get_type
216 redef class AAttrPropdef
217 redef meth accept_typing
(v
)
220 if n_expr
!= null then
221 v
.check_conform_expr
(n_expr
, prop
.signature
.return_type
)
226 redef class AMethPropdef
227 redef readable attr _self_var
: ParamVariable
228 redef meth accept_typing
(v
)
230 v
.variable_ctx
= new VariableContext
231 _self_var
= v
.self_var
236 redef class AConcreteInitPropdef
237 readable attr _super_init_calls
: Array[MMMethod] = new Array[MMMethod]
238 readable attr _explicit_super_init_calls
: Array[MMMethod] = new Array[MMMethod]
239 redef meth accept_typing
(v
)
241 v
.top_block
= n_block
242 v
.explicit_super_init_calls
= explicit_super_init_calls
243 v
.explicit_other_init_call
= false
245 if v
.explicit_other_init_call
or method
.global
.intro
!= method
then
249 var l
= explicit_super_init_calls
.length
250 var cur_m
: MMMethod = null
251 var cur_c
: MMLocalClass = null
253 cur_m
= explicit_super_init_calls
[i
]
254 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
257 while j
< v
.local_class
.cshe
.direct_greaters
.length
do
258 var c
= v
.local_class
.cshe
.direct_greaters
[j
]
259 if c
.global
.is_interface
or c
.global
.is_universal
or c
.global
.is_mixin
then
261 else if cur_c
!= null and (c
.cshe
<= cur_c
or cur_c
.global
.is_mixin
) then
262 if c
== cur_c
then j
+= 1
263 super_init_calls
.add
(cur_m
)
266 cur_m
= explicit_super_init_calls
[i
]
267 cur_c
= cur_m
.global
.intro
.local_class
.for_module
(v
.module)
273 var p
= v
.get_default_constructor_for
(self, c
, method
)
275 super_init_calls
.add
(p
)
285 redef meth after_typing
(v
)
287 # TODO: why the test?
288 if v
.variable_ctx
!= null then
289 v
.variable_ctx
.add
(variable
)
294 redef class AClosureDecl
295 # The corresponding escapable object
296 readable attr _escapable
: EscapableBlock
298 redef meth accept_typing
(v
)
300 # Register the closure for ClosureCallExpr
301 v
.variable_ctx
.add
(variable
)
303 var old_var_ctx
= v
.variable_ctx
304 v
.variable_ctx
= v
.variable_ctx
.sub
306 _escapable
= new EscapableClosure(self, variable
.closure
, null)
307 v
.escapable_ctx
.push
(_escapable
)
311 v
.variable_ctx
= old_var_ctx
317 readable attr _stype
: MMType
318 redef meth after_typing
(v
)
320 _stype
= get_stype
(v
)
325 redef readable attr _stype
: MMType
327 # Is the expression the implicit receiver
328 meth is_implicit_self
: Bool do return false
330 # Is the expression the current receiver (implicit or explicit)
331 meth is_self
: Bool do return false
333 # The variable accessed is any
334 meth its_variable
: Variable do return null
336 # The variable type information if current boolean expression is true
337 readable private attr _if_true_variable_ctx
: VariableContext
340 redef class AVardeclExpr
341 redef meth after_typing
(v
)
343 var va
= new VarVariable(n_id
.to_symbol
, self)
345 v
.variable_ctx
.add
(va
)
347 if n_type
!= null then
348 va
.stype
= n_type
.stype
349 if n_expr
!= null then
350 v
.check_conform_expr
(n_expr
, va
.stype
)
354 va
.stype
= n_expr
.stype
359 redef class ABlockExpr
360 redef meth accept_typing
(v
)
362 var old_var_ctx
= v
.variable_ctx
363 v
.variable_ctx
= v
.variable_ctx
.sub
367 v
.variable_ctx
= old_var_ctx
371 redef class AReturnExpr
372 redef meth after_typing
(v
)
374 var t
= v
.local_property
.signature
.return_type
375 if n_expr
== null and t
!= null then
376 v
.error
(self, "Error: Return without value in a function.")
377 else if n_expr
!= null and t
== null then
378 v
.error
(self, "Error: Return with value in a procedure.")
379 else if n_expr
!= null and t
!= null then
380 v
.check_conform_expr
(n_expr
, t
)
385 redef class AContinueExpr
386 redef meth after_typing
(v
)
388 var esc
= compute_escapable_block
(v
.escapable_ctx
)
389 if esc
== null then return
391 if esc
.is_break_block
then
392 v
.error
(self, "Error: 'continue' forbiden in break blocks.")
396 var t
= esc
.continue_stype
397 if n_expr
== null and t
!= null then
398 v
.error
(self, "Error: continue with a value required in this block.")
399 else if n_expr
!= null and t
== null then
400 v
.error
(self, "Error: continue without value required in this block.")
401 else if n_expr
!= null and t
!= null then
402 v
.check_conform_expr
(n_expr
, t
)
407 redef class ABreakExpr
408 redef meth after_typing
(v
)
410 var esc
= compute_escapable_block
(v
.escapable_ctx
)
411 if esc
== null then return
413 var bl
= esc
.break_list
414 if n_expr
== null and bl
!= null then
415 v
.error
(self, "Error: break with a value required in this block.")
416 else if n_expr
!= null and bl
== null then
417 v
.error
(self, "Error: break without value required in this block.")
418 else if n_expr
!= null and bl
!= null then
419 # Typing check can only be done later
426 redef meth accept_typing
(v
)
428 var old_var_ctx
= v
.variable_ctx
430 v
.check_conform_expr
(n_expr
, v
.type_bool
)
432 if n_expr
.if_true_variable_ctx
!= null then
433 v
.variable_ctx
= n_expr
.if_true_variable_ctx
437 # Restore variable ctx
438 v
.variable_ctx
= old_var_ctx
440 if n_else
!= null then
442 v
.variable_ctx
= old_var_ctx
447 redef class AWhileExpr
448 # The corresponding escapable block
449 readable attr _escapable
: EscapableBlock
451 redef meth accept_typing
(v
)
453 _escapable
= new EscapableBlock(self)
454 v
.escapable_ctx
.push
(_escapable
)
458 v
.check_conform_expr
(n_expr
, v
.type_bool
)
464 # The corresponding escapable block
465 readable attr _escapable
: EscapableBlock
467 readable attr _meth_iterator
: MMMethod
468 readable attr _meth_is_ok
: MMMethod
469 readable attr _meth_item
: MMMethod
470 readable attr _meth_next
: MMMethod
471 redef meth accept_typing
(v
)
473 _escapable
= new EscapableBlock(self)
474 v
.escapable_ctx
.push
(_escapable
)
476 v
.variable_ctx
= v
.variable_ctx
.sub
477 var va
= new AutoVariable(n_id
.to_symbol
, self)
479 v
.variable_ctx
.add
(va
)
483 var expr_type
= n_expr
.stype
484 if not v
.check_conform_expr
(n_expr
, v
.type_collection
) then
487 _meth_iterator
= expr_type
.local_class
.select_method
(once
("iterator".to_symbol
))
488 if _meth_iterator
== null then
489 v
.error
(self, "Error: Collection MUST have an iterate method")
492 var iter_type
= _meth_iterator
.signature_for
(expr_type
).return_type
493 _meth_is_ok
= iter_type
.local_class
.select_method
(once
("is_ok".to_symbol
))
494 if _meth_is_ok
== null then
495 v
.error
(self, "Error: {iter_type} MUST have an is_ok method")
498 _meth_item
= iter_type
.local_class
.select_method
(once
("item".to_symbol
))
499 if _meth_item
== null then
500 v
.error
(self, "Error: {iter_type} MUST have an item method")
503 _meth_next
= iter_type
.local_class
.select_method
(once
("next".to_symbol
))
504 if _meth_next
== null then
505 v
.error
(self, "Error: {iter_type} MUST have a next method")
508 var t
= _meth_item
.signature_for
(iter_type
).return_type
509 if not n_expr
.is_self
then t
= t
.not_for_self
512 if n_block
!= null then v
.visit
(n_block
)
515 var varctx
= v
.variable_ctx
516 assert varctx
isa SubVariableContext
517 v
.variable_ctx
= varctx
.prev
523 redef class AAssertExpr
524 redef meth after_typing
(v
)
526 v
.check_conform_expr
(n_expr
, v
.type_bool
)
527 if n_expr
.if_true_variable_ctx
!= null then v
.variable_ctx
= n_expr
.if_true_variable_ctx
532 redef meth its_variable
do return variable
534 redef meth after_typing
(v
)
536 _stype
= v
.variable_ctx
.stype
(variable
)
540 redef class AVarAssignExpr
541 redef meth after_typing
(v
)
543 var t
= v
.variable_ctx
.stype
(variable
)
544 v
.check_conform_expr
(n_value
, t
)
548 redef class AReassignFormExpr
549 # Compute and check method used through the reassigment operator
550 private meth do_lvalue_typing
(v
: TypingVisitor, type_lvalue
: MMType)
552 if type_lvalue
== null then
555 var name
= n_assign_op
.method_name
556 var lc
= type_lvalue
.local_class
557 if not lc
.has_global_property_by_name
(name
) then
558 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
561 var prop
= lc
.select_method
(name
)
562 prop
.global
.check_visibility
(v
, self, v
.module, false)
563 var psig
= prop
.signature_for
(type_lvalue
)
564 _assign_method
= prop
565 v
.check_conform_expr
(n_value
, psig
[0].not_for_self
)
566 v
.check_conform
(self, psig
.return_type
.not_for_self
, n_value
.stype
)
569 # Method used through the reassigment operator (once computed)
570 readable attr _assign_method
: MMMethod
573 redef class AVarReassignExpr
574 redef meth after_typing
(v
)
576 var t
= v
.variable_ctx
.stype
(variable
)
577 do_lvalue_typing
(v
, t
)
581 redef class PAssignOp
582 meth method_name
: Symbol is abstract
584 redef class APlusAssignOp
585 redef meth method_name
do return once
"+".to_symbol
587 redef class AMinusAssignOp
588 redef meth method_name
do return once
"-".to_symbol
591 redef class ASelfExpr
592 redef meth its_variable
do return variable
594 redef meth after_typing
(v
)
596 variable
= v
.self_var
597 _stype
= v
.variable_ctx
.stype
(variable
)
600 redef meth is_self
do return true
603 redef class AImplicitSelfExpr
604 redef meth is_implicit_self
do return true
607 redef class AIfexprExpr
608 redef meth accept_typing
(v
)
610 var old_var_ctx
= v
.variable_ctx
613 if n_expr
.if_true_variable_ctx
!= null then v
.variable_ctx
= n_expr
.if_true_variable_ctx
615 v
.variable_ctx
= old_var_ctx
618 v
.check_conform_expr
(n_expr
, v
.type_bool
)
620 _stype
= v
.check_conform_multiexpr
(null, [n_then
, n_else
])
624 redef class ABoolExpr
625 redef meth after_typing
(v
)
632 redef meth after_typing
(v
)
634 v
.check_conform_expr
(n_expr
, v
.type_bool
)
635 v
.check_conform_expr
(n_expr2
, v
.type_bool
)
641 redef meth accept_typing
(v
)
643 var old_var_ctx
= v
.variable_ctx
646 if n_expr
.if_true_variable_ctx
!= null then v
.variable_ctx
= n_expr
.if_true_variable_ctx
649 if n_expr2
.if_true_variable_ctx
!= null then
650 _if_true_variable_ctx
= n_expr2
.if_true_variable_ctx
652 _if_true_variable_ctx
= v
.variable_ctx
655 v
.variable_ctx
= old_var_ctx
657 v
.check_conform_expr
(n_expr
, v
.type_bool
)
658 v
.check_conform_expr
(n_expr2
, v
.type_bool
)
664 redef meth after_typing
(v
)
666 v
.check_conform_expr
(n_expr
, v
.type_bool
)
672 redef meth after_typing
(v
)
679 redef class AFloatExpr
680 redef meth after_typing
(v
)
682 _stype
= v
.type_float
686 redef class ACharExpr
687 redef meth after_typing
(v
)
693 redef class AStringFormExpr
694 readable attr _meth_with_native
: MMMethod
695 redef meth after_typing
(v
)
697 _stype
= v
.type_string
698 _meth_with_native
= _stype
.local_class
.select_method
(once
"with_native".to_symbol
)
699 if _meth_with_native
== null then v
.error
(self, "{_stype} MUST have a with_native method.")
703 redef class ASuperstringExpr
704 readable attr _meth_with_capacity
: MMMethod
705 readable attr _meth_add
: MMMethod
706 readable attr _meth_to_s
: MMMethod
707 readable attr _atype
: MMType
708 redef meth after_typing
(v
)
710 _stype
= v
.type_string
711 _atype
= v
.type_array
(_stype
)
712 _meth_with_capacity
= _atype
.local_class
.select_method
(once
"with_capacity".to_symbol
)
713 if _meth_with_capacity
== null then v
.error
(self, "{_atype} MUST have a with_capacity method.")
714 _meth_add
= _atype
.local_class
.select_method
(once
"add".to_symbol
)
715 if _meth_add
== null then v
.error
(self, "{_atype} MUST have an add method.")
716 _meth_to_s
= v
.type_object
.local_class
.select_method
(once
"to_s".to_symbol
)
717 if _meth_to_s
== null then v
.error
(self, "Object MUST have a to_s method.")
721 redef class ANullExpr
722 redef meth after_typing
(v
)
728 redef class AArrayExpr
729 readable attr _meth_with_capacity
: MMMethod
730 readable attr _meth_add
: MMMethod
732 redef meth after_typing
(v
)
734 var stype
= v
.check_conform_multiexpr
(null, n_exprs
)
735 if stype
== null then return
739 private meth do_typing
(v
: TypingVisitor, element_type
: MMType)
741 _stype
= v
.type_array
(element_type
)
743 _meth_with_capacity
= _stype
.local_class
.select_method
(once
"with_capacity".to_symbol
)
744 if _meth_with_capacity
== null then v
.error
(self, "{_stype} MUST have a with_capacity method.")
745 _meth_add
= _stype
.local_class
.select_method
(once
"add".to_symbol
)
746 if _meth_add
== null then v
.error
(self, "{_stype} MUST have an add method.")
750 redef class ARangeExpr
751 readable attr _meth_init
: MMMethod
752 redef meth after_typing
(v
)
754 var ntype
= n_expr
.stype
755 var ntype2
= n_expr2
.stype
756 if ntype
== null or ntype
== null then
759 if ntype
< ntype2
then
761 else if not ntype2
< ntype
then
762 v
.error
(self, "Type error: {ntype} incompatible with {ntype2}.")
765 var dtype
= v
.type_discrete
766 v
.check_conform_expr
(n_expr
, dtype
)
767 v
.check_conform_expr
(n_expr2
, dtype
)
768 _stype
= v
.type_range
(ntype
)
772 redef class ACrangeExpr
773 redef meth after_typing
(v
)
776 _meth_init
= stype
.local_class
.select_method
(once
"init".to_symbol
)
779 redef class AOrangeExpr
780 redef meth after_typing
(v
)
783 _meth_init
= stype
.local_class
.select_method
(once
"without_last".to_symbol
)
788 redef class ASuperExpr
789 special ASuperInitCall
790 # readable attr _prop: MMSrcMethod
791 readable attr _init_in_superclass
: MMMethod
792 redef meth after_typing
(v
)
794 var precs
: Array[MMLocalProperty] = v
.local_property
.prhe
.direct_greaters
795 if not precs
.is_empty
then
796 v
.local_property
.need_super
= true
797 else if v
.local_property
.global
.is_init
then
798 var base_precs
= v
.local_class
.super_methods_named
(v
.local_property
.name
)
799 for p
in base_precs
do
800 if not p
.global
.is_init
then
801 v
.error
(self, "Error: {p.local_class}::{p} is not a constructor.")
803 precs
.add
(v
.local_class
[p
.global
])
806 if precs
.is_empty
then
807 v
.error
(self, "Error: No contructor named {v.local_property.name} in superclasses.")
809 else if precs
.length
> 1 then
810 v
.error
(self, "Error: Conflicting contructors named {v.local_property.name} in superclasses: {precs.join(", ")}.")
813 var p
= base_precs
.first
814 assert p
isa MMMethod
815 _init_in_superclass
= p
816 register_super_init_call
(v
, p
)
817 if n_args
.length
> 0 then
818 var signature
= get_signature
(v
, v
.self_var
.stype
, p
, true)
819 _arguments
= process_signature
(v
, signature
, p
.name
, n_args
.to_a
)
822 v
.error
(self, "Error: No super method to call for {v.local_property}.")
826 if precs
.first
.signature_for
(v
.self_var
.stype
).return_type
!= null then
827 var stypes
= new Array[MMType]
828 var stype
: MMType = null
830 assert prop
isa MMMethod
831 var t
= prop
.signature_for
(v
.self_var
.stype
).return_type
.for_module
(v
.module).adapt_to
(v
.local_property
.signature
.recv
)
833 if stype
== null or stype
< t
then
838 v
.check_conform
(self, t
, stype
)
842 var p
= v
.local_property
843 assert p
isa MMSrcMethod
848 redef class AAttrFormExpr
850 readable attr _prop
: MMAttribute
852 # Attribute type of the acceded attribute
853 readable attr _attr_type
: MMType
855 # Compute the attribute accessed
856 private meth do_typing
(v
: TypingVisitor)
858 if not v
.check_expr
(n_expr
) then return
859 var type_recv
= n_expr
.stype
860 var name
= n_id
.to_symbol
861 var lc
= type_recv
.local_class
862 if not lc
.has_global_property_by_name
(name
) then
863 v
.error
(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
866 var prop
= lc
.select_attribute
(name
)
867 if v
.module.visibility_for
(prop
.global
.local_class
.module) < 3 then
868 v
.error
(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
871 var at
= prop
.signature_for
(type_recv
).return_type
872 if not n_expr
.is_self
then at
= at
.not_for_self
877 redef class AAttrExpr
878 redef meth after_typing
(v
)
888 redef class AAttrAssignExpr
889 redef meth after_typing
(v
)
895 v
.check_conform_expr
(n_value
, attr_type
)
899 redef class AAttrReassignExpr
900 redef meth after_typing
(v
)
906 do_lvalue_typing
(v
, attr_type
)
912 # The signature of the called property
913 readable attr _prop_signature
: MMSignature
915 # Compute the called global property
916 private meth do_typing
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, recv_is_self
: Bool, name
: Symbol, raw_args
: Array[PExpr], closure_defs
: Array[PClosureDef])
918 var prop
= get_property
(v
, type_recv
, is_implicit_self
, name
)
919 if prop
== null then return
920 var sig
= get_signature
(v
, type_recv
, prop
, recv_is_self
)
921 if sig
== null then return
922 var args
= process_signature
(v
, sig
, prop
.name
, raw_args
)
923 if args
== null then return
924 var rtype
= process_closures
(v
, sig
, prop
.name
, closure_defs
)
926 _prop_signature
= sig
931 private meth get_property
(v
: TypingVisitor, type_recv
: MMType, is_implicit_self
: Bool, name
: Symbol): MMMethod
933 if type_recv
== null then return null
934 var lc
= type_recv
.local_class
935 var prop
: MMMethod = null
936 if lc
.has_global_property_by_name
(name
) then prop
= lc
.select_method
(name
)
937 if prop
== null and v
.local_property
.global
.is_init
then
938 var props
= type_recv
.local_class
.super_methods_named
(name
)
939 if props
.length
> 1 then
940 v
.error
(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
942 else if props
.length
== 1 then
943 var p
= type_recv
.local_class
[props
.first
.global
]
944 assert p
isa MMMethod
950 if is_implicit_self
then
951 v
.error
(self, "Error: Method or variable '{name}' unknown in {type_recv}.")
953 v
.error
(self, "Error: Method '{name}' doesn't exists in {type_recv}.")
960 # Get the signature for a local property and a receiver
961 private meth get_signature
(v
: TypingVisitor, type_recv
: MMType, prop
: MMMethod, recv_is_self
: Bool): MMSignature
963 prop
.global
.check_visibility
(v
, self, v
.module, recv_is_self
)
964 var psig
= prop
.signature_for
(type_recv
)
965 if not recv_is_self
then psig
= psig
.not_for_self
969 # Check the conformity of a set of arguments `raw_args' to a signature.
970 private meth process_signature
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, raw_args
: Array[PExpr]): Array[PExpr]
972 var par_vararg
= psig
.vararg_rank
973 var par_arity
= psig
.arity
975 if raw_args
== null then raw_arity
= 0 else raw_arity
= raw_args
.length
976 if par_arity
> raw_arity
or (par_arity
!= raw_arity
and par_vararg
== -1) then
977 v
.error
(self, "Error: '{name}' arity missmatch.")
981 var args
= new Array[PExpr]
982 for par_idx
in [0..par_arity
[ do
984 var par_type
= psig
[par_idx
]
985 if par_idx
== par_vararg
then
986 var star
= new Array[PExpr]
987 for i
in [0..(raw_arity-par_arity
)] do
988 a
= raw_args
[arg_idx
]
989 v
.check_conform_expr
(a
, par_type
)
991 arg_idx
= arg_idx
+ 1
993 var aa
= new AArrayExpr.init_aarrayexpr
(star
)
994 aa
.do_typing
(v
, par_type
)
997 a
= raw_args
[arg_idx
]
998 v
.check_conform_expr
(a
, par_type
)
999 arg_idx
= arg_idx
+ 1
1006 # Check the conformity of a set of defined closures
1007 private meth process_closures
(v
: TypingVisitor, psig
: MMSignature, name
: Symbol, cd
: Array[PClosureDef]): MMType
1009 var t
= psig
.return_type
1010 var cs
= psig
.closures
# Declared closures
1013 if not c
.is_optional
then min_arity
+= 1
1016 if cs
.length
== 0 then
1017 v
.error
(self, "Error: {name} does not require blocks.")
1018 else if cd
.length
> cs
.length
or cd
.length
< min_arity
then
1019 v
.error
(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
1021 # Initialize the break list if a value is required for breaks (ie. if the method is a function)
1022 var break_list
: Array[ABreakExpr] = null
1023 if t
!= null then break_list
= new Array[ABreakExpr]
1025 # Process each closure definition
1026 for i
in [0..cd
.length
[ do
1029 var esc
= new EscapableClosure(cdi
, csi
, break_list
)
1030 v
.escapable_ctx
.push
(esc
)
1031 cdi
.accept_typing2
(v
, esc
)
1035 # Check break type conformity
1036 if break_list
!= null then
1037 t
= v
.check_conform_multiexpr
(t
, break_list
)
1040 else if min_arity
!= 0 then
1041 v
.error
(self, "Error: {name} requires {cs.length} blocks.")
1046 # The invoked method (once computed)
1047 readable attr _prop
: MMMethod
1049 # The real arguments used (after star transformation) (once computed)
1050 readable attr _arguments
: Array[PExpr]
1052 # The return type (if any) (once computed)
1053 readable attr _return_type
: MMType
1056 # A possible call of constructor in a super class
1057 # Could be an explicit call or with the 'super' keyword
1058 class ASuperInitCall
1059 special AAbsSendExpr
1060 private meth register_super_init_call
(v
: TypingVisitor, property
: MMMethod)
1062 if parent
!= v
.top_block
and self != v
.top_block
then
1063 v
.error
(self, "Error: Constructor invocation {property} must not be in nested block.")
1065 var cla
= v
.module[property
.global
.intro
.local_class
.global
]
1066 var prev_class
: MMLocalClass = null
1067 if not v
.explicit_super_init_calls
.is_empty
then
1068 prev_class
= v
.explicit_super_init_calls
.last
.global
.intro
.local_class
1070 var order
= v
.local_class
.cshe
.reverse_linear_extension
1071 if cla
== v
.local_class
then
1072 v
.explicit_other_init_call
= true
1073 else if not order
.has
(cla
) then
1074 v
.error
(self, "Error: Constructor of class {cla} must be one in {order.join(", ")}.")
1075 else if cla
== prev_class
then
1076 v
.error
(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
1078 var last_is_found
= prev_class
== null
1080 if c
== prev_class
then
1081 last_is_found
= true
1082 else if c
== cla
then
1083 if not last_is_found
then
1084 v
.error
(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
1086 v
.explicit_super_init_calls
.add
(property
)
1095 redef class ANewExpr
1096 special AAbsSendExpr
1097 redef meth after_typing
(v
)
1099 var t
= n_type
.stype
1100 if t
== null then return
1101 if t
.local_class
.global
.is_abstract
then
1102 v
.error
(self, "Error: try to instantiate abstract class {t.local_class}.")
1106 if n_id
== null then
1107 name
= once
"init".to_symbol
1109 name
= n_id
.to_symbol
1112 do_typing
(v
, t
, false, false, name
, n_args
.to_a
, null)
1113 if prop
== null then return
1115 if not prop
.global
.is_init
then
1116 v
.error
(self, "Error: {prop} is not a constructor.")
1123 redef class ASendExpr
1124 special ASuperInitCall
1125 # Name of the invoked property
1126 meth name
: Symbol is abstract
1128 # Raw arguments used (withour star transformation)
1129 meth raw_arguments
: Array[PExpr] is abstract
1131 # Closure definitions
1132 meth closure_defs
: Array[PClosureDef] do return null
1134 redef meth after_typing
(v
)
1139 private meth do_all_typing
(v
: TypingVisitor)
1141 if not v
.check_expr
(n_expr
) then return
1142 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_arguments
, closure_defs
)
1143 if prop
== null then return
1145 if prop
.global
.is_init
then
1146 if not v
.local_property
.global
.is_init
then
1147 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1148 else if not n_expr
.is_self
then
1149 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1151 register_super_init_call
(v
, prop
)
1155 _stype
= return_type
1159 class ASendReassignExpr
1161 special AReassignFormExpr
1162 readable attr _read_prop
: MMMethod
1163 redef meth do_all_typing
(v
)
1165 if not v
.check_expr
(n_expr
) then return
1166 var raw_args
= raw_arguments
1167 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, name
, raw_args
, null)
1168 if prop
== null then return
1169 if prop
.global
.is_init
then
1170 if not v
.local_property
.global
.is_init
then
1171 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1172 else if not n_expr
.is_self
then
1173 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1176 var t
= prop
.signature_for
(n_expr
.stype
).return_type
1177 if not n_expr
.is_self
then t
= t
.not_for_self
1179 do_lvalue_typing
(v
, t
)
1182 var old_args
= arguments
1183 raw_args
.add
(n_value
)
1185 do_typing
(v
, n_expr
.stype
, n_expr
.is_implicit_self
, n_expr
.is_self
, "{name}=".to_symbol
, raw_args
, null)
1186 if prop
== null then return
1187 if prop
.global
.is_init
then
1188 if not v
.local_property
.global
.is_init
then
1189 v
.error
(self, "Error: try to invoke constructor {prop} in a method.")
1190 else if not n_expr
.is_self
then
1191 v
.error
(self, "Error: constructor {prop} is not invoken on 'self'.")
1195 _arguments
= old_args
# FIXME: What if star parameters do not match betwen the two methods?
1199 redef class ABinopExpr
1200 redef meth raw_arguments
do return [n_expr2
]
1203 redef meth name
do return once
"==".to_symbol
1206 redef meth name
do return once
"!=".to_symbol
1209 redef meth name
do return once
"<".to_symbol
1212 redef meth name
do return once
"<=".to_symbol
1215 redef meth name
do return once
">".to_symbol
1218 redef meth name
do return once
">=".to_symbol
1220 redef class APlusExpr
1221 redef meth name
do return once
"+".to_symbol
1223 redef class AMinusExpr
1224 redef meth name
do return once
"-".to_symbol
1226 redef class AStarshipExpr
1227 redef meth name
do return once
"<=>".to_symbol
1229 redef class AStarExpr
1230 redef meth name
do return once
"*".to_symbol
1232 redef class ASlashExpr
1233 redef meth name
do return once
"/".to_symbol
1235 redef class APercentExpr
1236 redef meth name
do return once
"%".to_symbol
1239 redef class AUminusExpr
1240 redef meth name
do return once
"unary -".to_symbol
1241 redef meth raw_arguments
do return null
1244 redef class ACallFormExpr
1245 redef meth after_typing
(v
)
1247 if n_expr
!= null and n_expr
.is_implicit_self
then
1248 var name
= n_id
.to_symbol
1249 var variable
= v
.variable_ctx
[name
]
1250 if variable
!= null then
1251 if variable
isa ClosureVariable then
1252 var n
= new AClosureCallExpr(n_id
, n_args
, n_closure_defs
)
1254 n
.variable
= variable
1258 if not n_args
.is_empty
then
1259 v
.error
(self, "Error: {name} is variable, not a function.")
1261 var vform
= variable_create
(variable
)
1262 vform
.variable
= variable
1264 vform
.after_typing
(v
)
1273 redef meth closure_defs
1275 if n_closure_defs
== null or n_closure_defs
.is_empty
then
1278 return n_closure_defs
.to_a
1282 # Create a variable acces corresponding to the call form
1283 meth variable_create
(variable
: Variable): AVarFormExpr is abstract
1286 redef class ACallExpr
1287 redef meth variable_create
(variable
)
1289 return new AVarExpr.init_avarexpr
(n_id
)
1292 redef meth name
do return n_id
.to_symbol
1293 redef meth raw_arguments
do return n_args
.to_a
1296 redef class ACallAssignExpr
1297 redef meth variable_create
(variable
)
1299 return new AVarAssignExpr.init_avarassignexpr
(n_id
, n_assign
, n_value
)
1302 redef meth name
do return (n_id
.text
+ "=").to_symbol
1303 redef meth raw_arguments
do
1304 var res
= n_args
.to_a
1310 redef class ACallReassignExpr
1311 special ASendReassignExpr
1312 redef meth variable_create
(variable
)
1314 return new AVarReassignExpr.init_avarreassignexpr
(n_id
, n_assign_op
, n_value
)
1317 redef meth name
do return n_id
.to_symbol
1318 redef meth raw_arguments
do return n_args
.to_a
1321 redef class ABraExpr
1322 redef meth name
do return once
"[]".to_symbol
1323 redef meth raw_arguments
do return n_args
.to_a
1326 redef class ABraAssignExpr
1327 redef meth name
do return once
"[]=".to_symbol
1328 redef meth raw_arguments
do
1329 var res
= n_args
.to_a
1335 redef class ABraReassignExpr
1336 special ASendReassignExpr
1337 redef meth name
do return once
"[]".to_symbol
1338 redef meth raw_arguments
do return n_args
.to_a
1341 redef class AInitExpr
1342 redef meth name
do return once
"init".to_symbol
1343 redef meth raw_arguments
do return n_args
.to_a
1346 redef class AClosureCallExpr
1347 redef meth after_typing
(v
)
1350 var sig
= va
.closure
.signature
1351 var args
= process_signature
(v
, sig
, n_id
.to_symbol
, n_args
.to_a
)
1352 if closure_defs
!= null then
1353 process_closures
(v
, sig
, n_id
.to_symbol
, closure_defs
)
1355 if args
== null then return
1357 _prop_signature
= sig
1359 _stype
= sig
.return_type
1363 redef class PClosureDef
1364 # The corresponding escapable object
1365 readable attr _escapable
: EscapableBlock
1367 attr _accept_typing2
: Bool
1368 redef meth accept_typing
(v
)
1370 # Typing is deferred, wait accept_typing2(v)
1371 if _accept_typing2
then super
1374 private meth accept_typing2
(v
: TypingVisitor, esc
: EscapableClosure) is abstract
1377 redef class AClosureDef
1378 redef meth accept_typing2
(v
, esc
)
1382 var sig
= esc
.closure
.signature
1383 if sig
.arity
!= n_id
.length
then
1384 v
.error
(self, "Error: {sig.arity} automatic variable names expected, {n_id.length} found.")
1388 closure
= esc
.closure
1390 v
.variable_ctx
= v
.variable_ctx
.sub
1391 variables
= new Array[AutoVariable]
1392 for i
in [0..n_id
.length
[ do
1393 var va
= new AutoVariable(n_id
[i
].to_symbol
, self)
1396 v
.variable_ctx
.add
(va
)
1399 _accept_typing2
= true
1404 redef class AIsaExpr
1405 redef meth after_typing
(v
)
1407 var variable
= n_expr
.its_variable
1408 if variable
!= null then
1409 _if_true_variable_ctx
= v
.variable_ctx
.sub_with
(variable
, n_type
.stype
)
1411 _stype
= v
.type_bool
1415 redef class AAsCastExpr
1416 redef meth after_typing
(v
)
1418 v
.check_expr
(n_expr
)
1419 _stype
= n_type
.stype
1423 redef class AProxyExpr
1424 redef meth after_typing
(v
)
1426 _stype
= n_expr
.stype