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 # Analysis and verification of class definitions to instantiate model element
22 redef class ToolContext
23 var modelize_class_phase
: Phase = new ModelizeClassPhase(self, null)
26 private class ModelizeClassPhase
29 redef fun process_nmodule
(nmodule
)
31 toolcontext
.modelbuilder
.build_classes
(nmodule
)
35 redef class ModelBuilder
36 # Visit the AST and create the `MClass` objects
37 private fun build_a_mclass
(nmodule
: AModule, nclassdef
: AClassdef)
39 var mmodule
= nmodule
.mmodule
.as(not null)
42 var nkind
: nullable AClasskind
44 var nvisibility
: nullable AVisibility
45 var mvisibility
: nullable MVisibility
47 var names
= new Array[String]
48 if nclassdef
isa AStdClassdef then
49 name
= nclassdef
.n_id
.text
50 nkind
= nclassdef
.n_classkind
52 nvisibility
= nclassdef
.n_visibility
53 mvisibility
= nvisibility
.mvisibility
54 arity
= nclassdef
.n_formaldefs
.length
55 if mvisibility
== protected_visibility
then
56 error
(nvisibility
, "Error: only properties can be protected.")
58 else if mvisibility
== intrude_visibility
then
59 error
(nvisibility
, "Error: intrude is not a legal visibility for classes.")
62 # Collect formal parameter names
63 for i
in [0..arity
[ do
64 var nfd
= nclassdef
.n_formaldefs
[i
]
65 var ptname
= nfd
.n_id
.text
66 if names
.has
(ptname
) then
67 error
(nfd
, "Error: A formal parameter type `{ptname}' already exists")
70 for c
in ptname
.chars
do if c
>= 'a' and c
<= 'z' then
71 warning
(nfd
, "formal-type-name", "Warning: lowercase in the formal parameter type {ptname}")
77 else if nclassdef
isa ATopClassdef then
80 mkind
= interface_kind
82 mvisibility
= public_visibility
83 else if nclassdef
isa AMainClassdef then
88 mvisibility
= public_visibility
93 var mclass
= try_get_mclass_by_name
(nclassdef
, mmodule
, name
)
94 if mclass
== null then
95 if nclassdef
isa AStdClassdef and nclassdef
.n_kwredef
!= null then
96 error
(nclassdef
, "Redef error: No imported class {name} to refine.")
99 mclass
= new MClass(mmodule
, name
, names
, mkind
, mvisibility
)
100 #print "new class {mclass}"
101 else if nclassdef
isa AStdClassdef and nmodule
.mclass2nclassdef
.has_key
(mclass
) then
102 error
(nclassdef
, "Error: A class {name} is already defined at line {nmodule.mclass2nclassdef[mclass].location.line_start}.")
104 else if nclassdef
isa AStdClassdef and nclassdef
.n_kwredef
== null then
105 error
(nclassdef
, "Redef error: {name} is an imported class. Add the redef keyword to refine it.")
107 else if arity
!= 0 and mclass
.arity
!= arity
then
108 error
(nclassdef
, "Redef error: Formal parameter arity missmatch; got {arity}, expected {mclass.arity}.")
110 else if nkind
!= null and mkind
!= concrete_kind
and mclass
.kind
!= mkind
then
111 error
(nkind
, "Error: refinement changed the kind from a {mclass.kind} to a {mkind}")
112 else if nvisibility
!= null and mvisibility
!= public_visibility
and mclass
.visibility
!= mvisibility
then
113 error
(nvisibility
, "Error: refinement changed the visibility from a {mclass.visibility} to a {mvisibility}")
115 nclassdef
.mclass
= mclass
116 if not nmodule
.mclass2nclassdef
.has_key
(mclass
) then
117 nmodule
.mclass2nclassdef
[mclass
] = nclassdef
118 nclassdef
.all_defs
= [nclassdef
]
120 nmodule
.mclass2nclassdef
[mclass
].all_defs
.add
(nclassdef
)
124 # Visit the AST and create the `MClassDef` objects
125 private fun build_a_mclassdef
(nmodule
: AModule, nclassdef
: AClassdef)
127 var mmodule
= nmodule
.mmodule
.as(not null)
128 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
129 var mclass
= nclassdef
.mclass
130 if mclass
== null then return # Skip error
132 # In case of non-standard AClassdef, try to attach to an already existing mclassdef
133 var other_nclassdef
= nmodule
.mclass2nclassdef
[mclass
]
134 if other_nclassdef
!= nclassdef
then
135 assert not nclassdef
isa AStdClassdef
136 nclassdef
.mclassdef
= other_nclassdef
.mclassdef
140 var bounds
= new Array[MType]
141 if nclassdef
isa AStdClassdef and mclass
.arity
> 0 then
142 # Revolve bound for formal parameters
143 for i
in [0..mclass
.arity
[ do
144 if nclassdef
.n_formaldefs
.is_empty
then
146 var bound
= mclass
.intro
.bound_mtype
.arguments
[i
]
151 var nfd
= nclassdef
.n_formaldefs
[i
]
152 var pname
= mclass
.mparameters
[i
].name
153 if nfd
.n_id
.text
!= pname
then
154 error
(nfd
.n_id
, "Error: Formal parameter type #{i} `{nfd.n_id.text}` must be named `{pname}' as in the original definition in module `{mclass.intro.mmodule}`.")
156 var nfdt
= nfd
.n_type
158 var bound
= resolve_mtype_unchecked
(mmodule
, null, nfdt
, false)
159 if bound
== null then return # Forward error
160 if bound
.need_anchor
then
162 error
(nfd
, "Error: Formal parameter type `{pname}' bounded with a formal parameter type")
167 if bound
isa MClassType and bound
.mclass
.kind
== enum_kind
then
168 warning
(nfdt
, "useless-bound", "Warning: Useless formal parameter type since `{bound}` cannnot have subclasses.")
170 else if mclass
.mclassdefs
.is_empty
then
171 # No bound, then implicitely bound by nullable Object
172 var bound
= objectclass
.mclass_type
.as_nullable
177 var bound
= mclass
.intro
.bound_mtype
.arguments
[i
]
184 var bound_mtype
= mclass
.get_mtype
(bounds
)
185 var mclassdef
= new MClassDef(mmodule
, bound_mtype
, nclassdef
.location
)
186 nclassdef
.mclassdef
= mclassdef
187 self.mclassdef2nclassdef
[mclassdef
] = nclassdef
189 if nclassdef
isa AStdClassdef then
190 var ndoc
= nclassdef
.n_doc
192 var mdoc
= ndoc
.to_mdoc
193 mclassdef
.mdoc
= mdoc
194 mdoc
.original_mentity
= mclassdef
195 else if mclassdef
.is_intro
and mclass
.visibility
>= public_visibility
then
196 advice
(nclassdef
, "missing-doc", "Documentation warning: Undocumented public class `{mclass}`")
200 if mclassdef
.is_intro
then
201 self.toolcontext
.info
("{mclassdef} introduces new {mclass.kind} {mclass.full_name}", 3)
203 self.toolcontext
.info
("{mclassdef} refine {mclass.kind} {mclass.full_name}", 3)
207 # Visit the AST and set the super-types of the `MClassDef` objects
208 private fun collect_a_mclassdef_inheritance
(nmodule
: AModule, nclassdef
: AClassdef)
210 var mmodule
= nmodule
.mmodule
.as(not null)
211 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
212 var pointerclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Pointer")
213 var mclass
= nclassdef
.mclass
.as(not null)
214 var mclassdef
= nclassdef
.mclassdef
.as(not null)
216 # Do we need to specify Object as a super class?
217 var specobject
= true
219 # Do we need to specify Pointer as a super class? (is only valid
220 # if `nclassdef` is an extern class)
221 var specpointer
= true
223 var supertypes
= new Array[MClassType]
224 if nclassdef
isa AStdClassdef then
225 for nsc
in nclassdef
.n_superclasses
do
227 var ntype
= nsc
.n_type
228 var mtype
= resolve_mtype_unchecked
(mmodule
, mclassdef
, ntype
, false)
229 if mtype
== null then continue # Skip because of error
230 if not mtype
isa MClassType then
231 error
(ntype
, "Error: supertypes cannot be a formal type")
234 if not mclass
.kind
.can_specialize
(mtype
.mclass
.kind
) then
235 error
(ntype
, "Error: {mclass.kind} {mclass} cannot specialize {mtype.mclass.kind} {mtype.mclass}")
238 #print "new super : {mclass} < {mtype}"
239 if mtype
.mclass
.kind
== extern_kind
then specpointer
= false
243 if mclassdef
.is_intro
and objectclass
!= null then
244 if mclass
.kind
== extern_kind
and mclass
.name
!= "Pointer" then
245 # it is an extern class, but not a Pointer
246 if specpointer
then supertypes
.add pointerclass
.mclass_type
247 else if specobject
and mclass
.name
!= "Object" then
248 # it is a standard class without super class (but is not Object)
249 supertypes
.add objectclass
.mclass_type
253 mclassdef
.set_supertypes
(supertypes
)
254 if not supertypes
.is_empty
then self.toolcontext
.info
("{mclassdef} new super-types: {supertypes.join(", ")}", 3)
257 # Check the validity of the specialization heirarchy
258 private fun check_supertypes
(nmodule
: AModule, nclassdef
: AClassdef)
260 var mmodule
= nmodule
.mmodule
.as(not null)
261 var mclass
= nclassdef
.mclass
.as(not null)
262 var mclassdef
= nclassdef
.mclassdef
.as(not null)
264 for s
in mclassdef
.supertypes
do
265 if s
.is_subtype
(mmodule
, mclassdef
.bound_mtype
, mclassdef
.bound_mtype
) then
266 error
(nclassdef
, "Error: Inheritance loop for class {mclass} with type {s}")
271 # Build the classes of the module `nmodule`.
272 # REQUIRE: classes of imported modules are already build. (let `phase` do the job)
273 private fun build_classes
(nmodule
: AModule)
275 var errcount
= toolcontext
.error_count
276 # Force building recursively
277 if nmodule
.build_classes_is_done
then return
278 nmodule
.build_classes_is_done
= true
279 var mmodule
= nmodule
.mmodule
.as(not null)
280 for imp
in mmodule
.in_importation
.direct_greaters
do
282 if not mmodule2nmodule
.has_key
(imp
) then continue
283 build_classes
(mmodule2nmodule
[imp
])
286 if errcount
!= toolcontext
.error_count
then return
289 for nclassdef
in nmodule
.n_classdefs
do
290 self.build_a_mclass
(nmodule
, nclassdef
)
293 if errcount
!= toolcontext
.error_count
then return
295 # Create all classdefs
296 for nclassdef
in nmodule
.n_classdefs
do
297 self.build_a_mclassdef
(nmodule
, nclassdef
)
300 if errcount
!= toolcontext
.error_count
then return
302 # Create inheritance on all classdefs
303 for nclassdef
in nmodule
.n_classdefs
do
304 self.collect_a_mclassdef_inheritance
(nmodule
, nclassdef
)
307 if errcount
!= toolcontext
.error_count
then return
309 # Create the mclassdef hierarchy
310 for mclassdef
in mmodule
.mclassdefs
do
311 mclassdef
.add_in_hierarchy
314 if errcount
!= toolcontext
.error_count
then return
317 for nclassdef
in nmodule
.n_classdefs
do
318 self.check_supertypes
(nmodule
, nclassdef
)
321 if errcount
!= toolcontext
.error_count
then return
323 # Check unchecked ntypes
324 for nclassdef
in nmodule
.n_classdefs
do
325 if nclassdef
isa AStdClassdef then
326 var mclassdef
= nclassdef
.mclassdef
327 # check bound of formal parameter
328 for nfd
in nclassdef
.n_formaldefs
do
329 var nfdt
= nfd
.n_type
330 if nfdt
!= null and nfdt
.mtype
!= null then
331 var bound
= resolve_mtype
(mmodule
, mclassdef
, nfdt
)
332 if bound
== null then return # Forward error
335 # check declared super types
336 for nsc
in nclassdef
.n_superclasses
do
337 var ntype
= nsc
.n_type
338 if ntype
.mtype
!= null then
339 var mtype
= resolve_mtype
(mmodule
, mclassdef
, ntype
)
340 if mtype
== null then return # Forward error
346 if errcount
!= toolcontext
.error_count
then return
348 # Check clash of ancestors
349 for nclassdef
in nmodule
.n_classdefs
do
350 var mclassdef
= nclassdef
.mclassdef
.as(not null)
351 var superclasses
= new HashMap[MClass, MClassType]
352 for scd
in mclassdef
.in_hierarchy
.greaters
do
353 for st
in scd
.supertypes
do
354 if not superclasses
.has_key
(st
.mclass
) then
355 superclasses
[st
.mclass
] = st
356 else if superclasses
[st
.mclass
] != st
then
357 var st1
= superclasses
[st
.mclass
].resolve_for
(mclassdef
.mclass
.mclass_type
, mclassdef
.bound_mtype
, mmodule
, false)
358 var st2
= st
.resolve_for
(mclassdef
.mclass
.mclass_type
, mclassdef
.bound_mtype
, mmodule
, false)
360 error
(nclassdef
, "Error: Incompatibles ancestors for {mclassdef.mclass}: {st1}, {st2}")
367 if errcount
!= toolcontext
.error_count
then return
369 # TODO: Check that the super-class is not intrusive
371 # Check that the superclasses are not already known (by transitivity)
372 for nclassdef
in nmodule
.n_classdefs
do
373 if not nclassdef
isa AStdClassdef then continue
374 var mclassdef
= nclassdef
.mclassdef
.as(not null)
376 # Get the direct superclasses
377 # Since we are a mclassdef, just look at the mclassdef hierarchy
378 var parents
= new Array[MClass]
379 for sup
in mclassdef
.in_hierarchy
.direct_greaters
do
380 parents
.add
(sup
.mclass
)
383 # Used to track duplicates of superclasses
384 var seen_parents
= new ArrayMap[MClass, AType]
387 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
389 # Check each declared superclass to see if it belong to the direct superclass
390 for nsc
in nclassdef
.n_superclasses
do
391 var ntype
= nsc
.n_type
392 var mtype
= ntype
.mtype
393 if mtype
== null then continue
394 assert mtype
isa MClassType
395 var sc
= mtype
.mclass
396 if not parents
.has
(sc
) or sc
== objectclass
then
397 # Skip the warning on generated code
398 if ntype
.location
.file
!= null and not ntype
.location
.file
.filename
.is_empty
then
399 warning
(ntype
, "useless-superclass", "Warning: superfluous super-class {mtype} in class {mclassdef.mclass}.")
401 else if not seen_parents
.has_key
(sc
) then
402 seen_parents
[sc
] = ntype
404 warning
(ntype
, "useless-superclass", "Warning: duplicated super-class {mtype} in class {mclassdef.mclass}.")
410 # Register the nclassdef associated to each mclassdef
411 # FIXME: why not refine the `MClassDef` class with a nullable attribute?
412 var mclassdef2nclassdef
= new HashMap[MClassDef, AClassdef]
414 # Return the static type associated to the node `ntype`.
415 # `mmodule` and `mclassdef` is the context where the call is made (used to understand formal types)
416 # In case of problem, an error is displayed on `ntype` and null is returned.
417 # FIXME: the name "resolve_mtype" is awful
418 fun resolve_mtype_unchecked
(mmodule
: MModule, mclassdef
: nullable MClassDef, ntype
: AType, with_virtual
: Bool): nullable MType
420 var name
= ntype
.n_id
.text
424 if mclassdef
!= null and with_virtual
then
425 var prop
= try_get_mproperty_by_name
(ntype
, mclassdef
, name
).as(nullable MVirtualTypeProp)
427 if not ntype
.n_types
.is_empty
then
428 error
(ntype
, "Type error: formal type {name} cannot have formal parameters.")
430 res
= prop
.mvirtualtype
431 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
437 # Check parameter type
438 if mclassdef
!= null then
439 for p
in mclassdef
.mclass
.mparameters
do
440 if p
.name
!= name
then continue
442 if not ntype
.n_types
.is_empty
then
443 error
(ntype
, "Type error: formal type {name} cannot have formal parameters.")
447 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
454 var mclass
= try_get_mclass_by_name
(ntype
, mmodule
, name
)
455 if mclass
!= null then
456 var arity
= ntype
.n_types
.length
457 if arity
!= mclass
.arity
then
459 error
(ntype
, "Type error: '{name}' is a generic class.")
460 else if mclass
.arity
== 0 then
461 error
(ntype
, "Type error: '{name}' is not a generic class.")
463 error
(ntype
, "Type error: '{name}' has {mclass.arity} parameters ({arity} are provided).")
468 res
= mclass
.mclass_type
469 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
473 var mtypes
= new Array[MType]
474 for nt
in ntype
.n_types
do
475 var mt
= resolve_mtype_unchecked
(mmodule
, mclassdef
, nt
, with_virtual
)
476 if mt
== null then return null # Forward error
479 res
= mclass
.get_mtype
(mtypes
)
480 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
486 # If everything fail, then give up :(
487 error
(ntype
, "Type error: class {name} not found in module {mmodule}.")
491 # Return the static type associated to the node `ntype`.
492 # `mmodule` and `mclassdef` is the context where the call is made (used to understand formal types)
493 # In case of problem, an error is displayed on `ntype` and null is returned.
494 # FIXME: the name "resolve_mtype" is awful
495 fun resolve_mtype
(mmodule
: MModule, mclassdef
: nullable MClassDef, ntype
: AType): nullable MType
497 var mtype
= ntype
.mtype
498 if mtype
== null then mtype
= resolve_mtype_unchecked
(mmodule
, mclassdef
, ntype
, true)
499 if mtype
== null then return null # Forward error
501 if ntype
.checked_mtype
then return mtype
502 if mtype
isa MGenericType then
503 var mclass
= mtype
.mclass
504 for i
in [0..mclass
.arity
[ do
505 var bound
= mclass
.intro
.bound_mtype
.arguments
[i
]
506 var nt
= ntype
.n_types
[i
]
507 var mt
= resolve_mtype
(mmodule
, mclassdef
, nt
)
508 if mt
== null then return null # forward error
510 if mclassdef
!= null then anchor
= mclassdef
.bound_mtype
else anchor
= null
511 if not mt
.is_subtype
(mmodule
, anchor
, bound
) then
512 error
(nt
, "Type error: expected {bound}, got {mt}")
517 ntype
.checked_mtype
= true
524 # Flag that indicate if the class building is already completed
525 var build_classes_is_done
: Bool = false
526 # What is the AClassdef associated to a `MClass`?
527 # Used to check multiple definition of a class.
528 var mclass2nclassdef
: Map[MClass, AClassdef] = new HashMap[MClass, AClassdef]
531 redef class AClassdef
532 # The associated MClass once build by a `ModelBuilder`
533 var mclass
: nullable MClass
534 # The associated MClassDef once build by a `ModelBuilder`
535 var mclassdef
: nullable MClassDef
536 # All (self and other) definitions for the same mclassdef
537 var all_defs
: nullable Array[AClassdef]
540 redef class AClasskind
541 # The class kind associated with the AST node class
542 private fun mkind
: MClassKind is abstract
544 redef class AConcreteClasskind
545 redef fun mkind
do return concrete_kind
547 redef class AAbstractClasskind
548 redef fun mkind
do return abstract_kind
550 redef class AInterfaceClasskind
551 redef fun mkind
do return interface_kind
553 redef class AEnumClasskind
554 redef fun mkind
do return enum_kind
556 redef class AExternClasskind
557 redef fun mkind
do return extern_kind
560 redef class AFormaldef
561 # The associated parameter type
562 var mtype
: nullable MParameterType = null
564 # The associated bound
565 var bound
: nullable MType = null
569 # The mtype associated to the node
570 var mtype
: nullable MType = null
572 # Is the mtype a valid one?
573 var checked_mtype
: Bool = false