1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 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 # Computing of super-constructors that must be implicitely called at the begin of constructors.
18 # The current rules are a bit crazy but whatever.
19 module auto_super_init
25 redef class ToolContext
26 var auto_super_init_phase
: Phase = new AutoSuperInitPhase(self, [typing_phase
])
29 private class AutoSuperInitPhase
31 redef fun process_npropdef
(npropdef
) do if npropdef
isa AMethPropdef then npropdef
.do_auto_super_init
(toolcontext
.modelbuilder
)
34 private class AutoSuperInitVisitor
42 n
.accept_auto_super_init
(self)
46 var has_explicit_super_init
: nullable ANode = null
50 redef class AMethPropdef
51 # In case of constructor, the list of implicit auto super init constructors invoked (if needed)
52 var auto_super_inits
: nullable Array[CallSite] = null
54 fun do_auto_super_init
(modelbuilder
: ModelBuilder)
56 var mclassdef
= self.parent
.as(AClassdef).mclassdef
.as(not null)
57 var mpropdef
= self.mpropdef
.as(not null)
58 var mmodule
= mpropdef
.mclassdef
.mmodule
59 var anchor
= mclassdef
.bound_mtype
60 var recvtype
= mclassdef
.mclass
.mclass_type
62 # Get the annotation, but check its pertinence before returning
63 var nosuper
= get_single_annotation
("nosuper", modelbuilder
)
65 # Collect only for constructors
66 if not mpropdef
.mproperty
.is_init
then
67 if nosuper
!= null then modelbuilder
.error
(nosuper
, "Error: nosuper only in `init`")
71 # FIXME: THIS IS STUPID (be here to keep the old code working)
72 if not mpropdef
.mclassdef
.is_intro
then return
74 # Do we inherit for a constructor?
76 for cd
in mclassdef
.in_hierarchy
.direct_greaters
do
77 if cd
.mclass
.kind
.need_init
then skip
= false
81 # Now we search for the absence of any explicit super-init invocation
83 # * via a call of an other init
84 var nblock
= self.n_block
85 if nblock
!= null then
86 var v
= new AutoSuperInitVisitor
88 var anode
= v
.has_explicit_super_init
90 if nosuper
!= null then modelbuilder
.error
(anode
, "Error: method is annotated nosuper but a constructor call is present")
95 if nosuper
!= null then return
97 # Still here? So it means that we must determine what super inits need to be automatically invoked
99 var auto_super_inits
= new Array[CallSite]
100 for msupertype
in mclassdef
.supertypes
do
101 # FIXME: the order is quite arbitrary
102 if not msupertype
.mclass
.kind
.need_init
then continue
103 msupertype
= msupertype
.anchor_to
(mmodule
, mclassdef
.bound_mtype
)
104 var candidate
= modelbuilder
.try_get_mproperty_by_name2
(self, mmodule
, msupertype
, mpropdef
.mproperty
.name
)
105 if candidate
== null then
106 candidate
= modelbuilder
.try_get_mproperty_by_name2
(self, mmodule
, msupertype
, "init")
108 if candidate
== null then
109 modelbuilder
.error
(self, "Error: Cannot do an implicit constructor call in {mpropdef}; there is no constructor named {mpropdef.mproperty.name} in {msupertype}.")
112 assert candidate
isa MMethod
114 var candidatedefs
= candidate
.lookup_definitions
(mmodule
, anchor
)
115 var candidatedef
= candidatedefs
.first
116 # TODO, we drop the others propdefs in the callsite, that is not great :(
118 var msignature
= candidatedef
.msignature
119 msignature
= msignature
.resolve_for
(recvtype
, anchor
, mmodule
, true)
121 var callsite
= new CallSite(self, recvtype
, mmodule
, anchor
, true, candidate
, candidatedef
, msignature
, false)
122 auto_super_inits
.add
(callsite
)
124 if auto_super_inits
.is_empty
then
125 modelbuilder
.error
(self, "Error: No constructors to call implicitely in {mpropdef}. Call one explicitely.")
128 for auto_super_init
in auto_super_inits
do
129 var auto_super_init_def
= auto_super_init
.mpropdef
130 var msig
= mpropdef
.msignature
.as(not null)
131 var supermsig
= auto_super_init
.msignature
132 if supermsig
.arity
> msig
.arity
then
133 modelbuilder
.error
(self, "Error: Cannot do an implicit constructor call to {auto_super_init_def}{supermsig}. Expected at least {supermsig.arity} arguments, got {msig.arity}.")
137 for sp
in supermsig
.mparameters
do
138 var p
= msig
.mparameters
[i
]
141 if not sub
.is_subtype
(mmodule
, anchor
, sup
) then
142 modelbuilder
.error
(self, "Error: Cannot do an implicit constructor call to {auto_super_init_def}{supermsig}. Expected argument #{i} of type {sp.mtype}, got implicit argument {p.name} of type {p.mtype}.")
148 self.auto_super_inits
= auto_super_inits
154 private fun accept_auto_super_init
(v
: AutoSuperInitVisitor) do end
158 redef class ASendExpr
159 redef fun accept_auto_super_init
(v
)
161 var mproperty
= self.callsite
.mproperty
162 if mproperty
== null then return
163 if mproperty
.is_init
then
164 v
.has_explicit_super_init
= self
169 redef class ASuperExpr
170 redef fun accept_auto_super_init
(v
)
172 # If the super is a standard call-next-method then there it is considered am explicit super init call
173 # The the super is a "super int" then it is also an explicit super init call
174 v
.has_explicit_super_init
= self