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 if nclassdef
isa AStdClassdef then
48 name
= nclassdef
.n_id
.text
49 nkind
= nclassdef
.n_classkind
51 nvisibility
= nclassdef
.n_visibility
52 mvisibility
= nvisibility
.mvisibility
53 arity
= nclassdef
.n_formaldefs
.length
54 if mvisibility
== protected_visibility
then
55 error
(nvisibility
, "Error: only properties can be protected.")
57 else if mvisibility
== intrude_visibility
then
58 error
(nvisibility
, "Error: intrude is not a legal visibility for classes.")
61 else if nclassdef
isa ATopClassdef then
64 mkind
= interface_kind
66 mvisibility
= public_visibility
67 else if nclassdef
isa AMainClassdef then
72 mvisibility
= public_visibility
77 var mclass
= try_get_mclass_by_name
(nclassdef
, mmodule
, name
)
78 if mclass
== null then
79 if nclassdef
isa AStdClassdef and nclassdef
.n_kwredef
!= null then
80 error
(nclassdef
, "Redef error: No imported class {name} to refine.")
83 mclass
= new MClass(mmodule
, name
, arity
, mkind
, mvisibility
)
84 #print "new class {mclass}"
85 else if nclassdef
isa AStdClassdef and nmodule
.mclass2nclassdef
.has_key
(mclass
) then
86 error
(nclassdef
, "Error: A class {name} is already defined at line {nmodule.mclass2nclassdef[mclass].location.line_start}.")
88 else if nclassdef
isa AStdClassdef and nclassdef
.n_kwredef
== null then
89 error
(nclassdef
, "Redef error: {name} is an imported class. Add the redef keyword to refine it.")
91 else if mclass
.arity
!= arity
then
92 error
(nclassdef
, "Redef error: Formal parameter arity missmatch; got {arity}, expected {mclass.arity}.")
94 else if nkind
!= null and mkind
!= concrete_kind
and mclass
.kind
!= mkind
then
95 error
(nkind
, "Error: refinement changed the kind from a {mclass.kind} to a {mkind}")
96 else if nvisibility
!= null and mvisibility
!= public_visibility
and mclass
.visibility
!= mvisibility
then
97 error
(nvisibility
, "Error: refinement changed the visibility from a {mclass.visibility} to a {mvisibility}")
99 nclassdef
.mclass
= mclass
100 if not nmodule
.mclass2nclassdef
.has_key
(mclass
) then
101 nmodule
.mclass2nclassdef
[mclass
] = nclassdef
102 nclassdef
.all_defs
= [nclassdef
]
104 nmodule
.mclass2nclassdef
[mclass
].all_defs
.add
(nclassdef
)
108 # Visit the AST and create the `MClassDef` objects
109 private fun build_a_mclassdef
(nmodule
: AModule, nclassdef
: AClassdef)
111 var mmodule
= nmodule
.mmodule
.as(not null)
112 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
113 var mclass
= nclassdef
.mclass
114 if mclass
== null then return # Skip error
116 # In case of non-standard AClassdef, try to attach to an already existing mclassdef
117 var other_nclassdef
= nmodule
.mclass2nclassdef
[mclass
]
118 if other_nclassdef
!= nclassdef
then
119 assert not nclassdef
isa AStdClassdef
120 nclassdef
.mclassdef
= other_nclassdef
.mclassdef
124 var names
= new Array[String]
125 var bounds
= new Array[MType]
126 if nclassdef
isa AStdClassdef and mclass
.arity
> 0 then
127 # Collect formal parameter names
128 for i
in [0..mclass
.arity
[ do
129 var nfd
= nclassdef
.n_formaldefs
[i
]
130 var ptname
= nfd
.n_id
.text
131 if names
.has
(ptname
) then
132 error
(nfd
, "Error: A formal parameter type `{ptname}' already exists")
135 for c
in ptname
.chars
do if c
>= 'a' and c
<= 'z' then
136 warning
(nfd
, "formal-type-name", "Warning: lowercase in the formal parameter type {ptname}")
140 nfd
.mtype
= mclass
.mclass_type
.arguments
[i
].as(MParameterType)
143 # Revolve bound for formal parameter names
144 for i
in [0..mclass
.arity
[ do
145 var nfd
= nclassdef
.n_formaldefs
[i
]
146 var nfdt
= nfd
.n_type
148 var bound
= resolve_mtype_unchecked
(mmodule
, null, nfdt
, false)
149 if bound
== null then return # Forward error
150 if bound
.need_anchor
then
152 error
(nfd
, "Error: Formal parameter type `{names[i]}' bounded with a formal parameter type")
157 if bound
isa MClassType and bound
.mclass
.kind
== enum_kind
then
158 warning
(nfdt
, "useless-bound", "Warning: Useless formal parameter type since `{bound}` cannnot have subclasses.")
160 else if mclass
.mclassdefs
.is_empty
then
161 # No bound, then implicitely bound by nullable Object
162 var bound
= objectclass
.mclass_type
.as_nullable
167 var bound
= mclass
.intro
.bound_mtype
.arguments
[i
]
174 var bound_mtype
= mclass
.get_mtype
(bounds
)
175 var mclassdef
= new MClassDef(mmodule
, bound_mtype
, nclassdef
.location
, names
)
176 nclassdef
.mclassdef
= mclassdef
177 self.mclassdef2nclassdef
[mclassdef
] = nclassdef
179 if nclassdef
isa AStdClassdef then
180 var ndoc
= nclassdef
.n_doc
182 var mdoc
= ndoc
.to_mdoc
183 mclassdef
.mdoc
= mdoc
184 mdoc
.original_mentity
= mclassdef
185 else if mclassdef
.is_intro
and mclass
.visibility
>= public_visibility
then
186 advice
(nclassdef
, "missing-doc", "Documentation warning: Undocumented public class `{mclass}`")
190 if mclassdef
.is_intro
then
191 self.toolcontext
.info
("{mclassdef} introduces new {mclass.kind} {mclass.full_name}", 3)
193 self.toolcontext
.info
("{mclassdef} refine {mclass.kind} {mclass.full_name}", 3)
197 # Visit the AST and set the super-types of the `MClassDef` objects
198 private fun collect_a_mclassdef_inheritance
(nmodule
: AModule, nclassdef
: AClassdef)
200 var mmodule
= nmodule
.mmodule
.as(not null)
201 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
202 var pointerclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Pointer")
203 var mclass
= nclassdef
.mclass
.as(not null)
204 var mclassdef
= nclassdef
.mclassdef
.as(not null)
206 # Do we need to specify Object as a super class?
207 var specobject
= true
209 # Do we need to specify Pointer as a super class? (is only valid
210 # if `nclassdef` is an extern class)
211 var specpointer
= true
213 var supertypes
= new Array[MClassType]
214 if nclassdef
isa AStdClassdef then
215 for nsc
in nclassdef
.n_superclasses
do
217 var ntype
= nsc
.n_type
218 var mtype
= resolve_mtype_unchecked
(mmodule
, mclassdef
, ntype
, false)
219 if mtype
== null then continue # Skip because of error
220 if not mtype
isa MClassType then
221 error
(ntype
, "Error: supertypes cannot be a formal type")
224 if not mclass
.kind
.can_specialize
(mtype
.mclass
.kind
) then
225 error
(ntype
, "Error: {mclass.kind} {mclass} cannot specialize {mtype.mclass.kind} {mtype.mclass}")
228 #print "new super : {mclass} < {mtype}"
229 if mtype
.mclass
.kind
== extern_kind
then specpointer
= false
233 if mclassdef
.is_intro
and objectclass
!= null then
234 if mclass
.kind
== extern_kind
and mclass
.name
!= "Pointer" then
235 # it is an extern class, but not a Pointer
236 if specpointer
then supertypes
.add pointerclass
.mclass_type
237 else if specobject
and mclass
.name
!= "Object" then
238 # it is a standard class without super class (but is not Object)
239 supertypes
.add objectclass
.mclass_type
243 mclassdef
.set_supertypes
(supertypes
)
244 if not supertypes
.is_empty
then self.toolcontext
.info
("{mclassdef} new super-types: {supertypes.join(", ")}", 3)
247 # Check the validity of the specialization heirarchy
248 private fun check_supertypes
(nmodule
: AModule, nclassdef
: AClassdef)
250 var mmodule
= nmodule
.mmodule
.as(not null)
251 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
252 var mclass
= nclassdef
.mclass
.as(not null)
253 var mclassdef
= nclassdef
.mclassdef
.as(not null)
255 for s
in mclassdef
.supertypes
do
256 if s
.is_subtype
(mmodule
, mclassdef
.bound_mtype
, mclassdef
.bound_mtype
) then
257 error
(nclassdef
, "Error: Inheritance loop for class {mclass} with type {s}")
262 # Build the classes of the module `nmodule`.
263 # REQUIRE: classes of imported modules are already build. (let `phase` do the job)
264 private fun build_classes
(nmodule
: AModule)
266 var errcount
= toolcontext
.error_count
267 # Force building recursively
268 if nmodule
.build_classes_is_done
then return
269 nmodule
.build_classes_is_done
= true
270 var mmodule
= nmodule
.mmodule
.as(not null)
271 for imp
in mmodule
.in_importation
.direct_greaters
do
273 if not mmodule2nmodule
.has_key
(imp
) then continue
274 build_classes
(mmodule2nmodule
[imp
])
277 if errcount
!= toolcontext
.error_count
then return
280 for nclassdef
in nmodule
.n_classdefs
do
281 self.build_a_mclass
(nmodule
, nclassdef
)
284 if errcount
!= toolcontext
.error_count
then return
286 # Create all classdefs
287 for nclassdef
in nmodule
.n_classdefs
do
288 self.build_a_mclassdef
(nmodule
, nclassdef
)
291 if errcount
!= toolcontext
.error_count
then return
293 # Create inheritance on all classdefs
294 for nclassdef
in nmodule
.n_classdefs
do
295 self.collect_a_mclassdef_inheritance
(nmodule
, nclassdef
)
298 if errcount
!= toolcontext
.error_count
then return
300 # Create the mclassdef hierarchy
301 for mclassdef
in mmodule
.mclassdefs
do
302 mclassdef
.add_in_hierarchy
305 if errcount
!= toolcontext
.error_count
then return
308 for nclassdef
in nmodule
.n_classdefs
do
309 self.check_supertypes
(nmodule
, nclassdef
)
312 if errcount
!= toolcontext
.error_count
then return
314 # Check unchecked ntypes
315 for nclassdef
in nmodule
.n_classdefs
do
316 if nclassdef
isa AStdClassdef then
317 var mclassdef
= nclassdef
.mclassdef
318 # check bound of formal parameter
319 for nfd
in nclassdef
.n_formaldefs
do
320 var nfdt
= nfd
.n_type
321 if nfdt
!= null and nfdt
.mtype
!= null then
322 var bound
= resolve_mtype
(mmodule
, mclassdef
, nfdt
)
323 if bound
== null then return # Forward error
326 # check declared super types
327 for nsc
in nclassdef
.n_superclasses
do
328 var ntype
= nsc
.n_type
329 if ntype
.mtype
!= null then
330 var mtype
= resolve_mtype
(mmodule
, mclassdef
, ntype
)
331 if mtype
== null then return # Forward error
337 if errcount
!= toolcontext
.error_count
then return
339 # Check clash of ancestors
340 for nclassdef
in nmodule
.n_classdefs
do
341 var mclassdef
= nclassdef
.mclassdef
.as(not null)
342 var superclasses
= new HashMap[MClass, MClassType]
343 for scd
in mclassdef
.in_hierarchy
.greaters
do
344 for st
in scd
.supertypes
do
345 if not superclasses
.has_key
(st
.mclass
) then
346 superclasses
[st
.mclass
] = st
347 else if superclasses
[st
.mclass
] != st
then
348 var st1
= superclasses
[st
.mclass
].resolve_for
(mclassdef
.mclass
.mclass_type
, mclassdef
.bound_mtype
, mmodule
, false)
349 var st2
= st
.resolve_for
(mclassdef
.mclass
.mclass_type
, mclassdef
.bound_mtype
, mmodule
, false)
351 error
(nclassdef
, "Error: Incompatibles ancestors for {mclassdef.mclass}: {st1}, {st2}")
358 if errcount
!= toolcontext
.error_count
then return
360 # TODO: Check that the super-class is not intrusive
362 # Check that the superclasses are not already known (by transitivity)
363 for nclassdef
in nmodule
.n_classdefs
do
364 if not nclassdef
isa AStdClassdef then continue
365 var mclassdef
= nclassdef
.mclassdef
.as(not null)
367 # Get the direct superclasses
368 # Since we are a mclassdef, just look at the mclassdef hierarchy
369 var parents
= new Array[MClass]
370 for sup
in mclassdef
.in_hierarchy
.direct_greaters
do
371 parents
.add
(sup
.mclass
)
374 # Used to track duplicates of superclasses
375 var seen_parents
= new ArrayMap[MClass, AType]
378 var objectclass
= try_get_mclass_by_name
(nmodule
, mmodule
, "Object")
380 # Check each declared superclass to see if it belong to the direct superclass
381 for nsc
in nclassdef
.n_superclasses
do
382 var ntype
= nsc
.n_type
383 var mtype
= ntype
.mtype
384 if mtype
== null then continue
385 assert mtype
isa MClassType
386 var sc
= mtype
.mclass
387 if not parents
.has
(sc
) or sc
== objectclass
then
388 # Skip the warning on generated code
389 if ntype
.location
.file
!= null and not ntype
.location
.file
.filename
.is_empty
then
390 warning
(ntype
, "useless-superclass", "Warning: superfluous super-class {mtype} in class {mclassdef.mclass}.")
392 else if not seen_parents
.has_key
(sc
) then
393 seen_parents
[sc
] = ntype
395 warning
(ntype
, "useless-superclass", "Warning: duplicated super-class {mtype} in class {mclassdef.mclass}.")
401 # Register the nclassdef associated to each mclassdef
402 # FIXME: why not refine the `MClassDef` class with a nullable attribute?
403 var mclassdef2nclassdef
: HashMap[MClassDef, AClassdef] = new HashMap[MClassDef, AClassdef]
405 # Return the static type associated to the node `ntype`.
406 # `mmodule` and `mclassdef` is the context where the call is made (used to understand formal types)
407 # In case of problem, an error is displayed on `ntype` and null is returned.
408 # FIXME: the name "resolve_mtype" is awful
409 fun resolve_mtype_unchecked
(mmodule
: MModule, mclassdef
: nullable MClassDef, ntype
: AType, with_virtual
: Bool): nullable MType
411 var name
= ntype
.n_id
.text
415 if mclassdef
!= null and with_virtual
then
416 var prop
= try_get_mproperty_by_name
(ntype
, mclassdef
, name
).as(nullable MVirtualTypeProp)
418 if not ntype
.n_types
.is_empty
then
419 error
(ntype
, "Type error: formal type {name} cannot have formal parameters.")
421 res
= prop
.mvirtualtype
422 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
428 # Check parameter type
429 if mclassdef
!= null and mclassdef
.parameter_names
.has
(name
) then
430 if not ntype
.n_types
.is_empty
then
431 error
(ntype
, "Type error: formal type {name} cannot have formal parameters.")
433 for i
in [0..mclassdef
.parameter_names
.length
[ do
434 if mclassdef
.parameter_names
[i
] == name
then
435 res
= mclassdef
.mclass
.mclass_type
.arguments
[i
]
436 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
445 var mclass
= try_get_mclass_by_name
(ntype
, mmodule
, name
)
446 if mclass
!= null then
447 var arity
= ntype
.n_types
.length
448 if arity
!= mclass
.arity
then
450 error
(ntype
, "Type error: '{name}' is a generic class.")
451 else if mclass
.arity
== 0 then
452 error
(ntype
, "Type error: '{name}' is not a generic class.")
454 error
(ntype
, "Type error: '{name}' has {mclass.arity} parameters ({arity} are provided).")
459 res
= mclass
.mclass_type
460 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
464 var mtypes
= new Array[MType]
465 for nt
in ntype
.n_types
do
466 var mt
= resolve_mtype_unchecked
(mmodule
, mclassdef
, nt
, with_virtual
)
467 if mt
== null then return null # Forward error
470 res
= mclass
.get_mtype
(mtypes
)
471 if ntype
.n_kwnullable
!= null then res
= res
.as_nullable
477 # If everything fail, then give up :(
478 error
(ntype
, "Type error: class {name} not found in module {mmodule}.")
482 # Return the static type associated to the node `ntype`.
483 # `mmodule` and `mclassdef` is the context where the call is made (used to understand formal types)
484 # In case of problem, an error is displayed on `ntype` and null is returned.
485 # FIXME: the name "resolve_mtype" is awful
486 fun resolve_mtype
(mmodule
: MModule, mclassdef
: nullable MClassDef, ntype
: AType): nullable MType
488 var mtype
= ntype
.mtype
489 if mtype
== null then mtype
= resolve_mtype_unchecked
(mmodule
, mclassdef
, ntype
, true)
490 if mtype
== null then return null # Forward error
492 if ntype
.checked_mtype
then return mtype
493 if mtype
isa MGenericType then
494 var mclass
= mtype
.mclass
495 for i
in [0..mclass
.arity
[ do
496 var bound
= mclass
.intro
.bound_mtype
.arguments
[i
]
497 var nt
= ntype
.n_types
[i
]
498 var mt
= resolve_mtype
(mmodule
, mclassdef
, nt
)
499 if mt
== null then return null # forward error
501 if mclassdef
!= null then anchor
= mclassdef
.bound_mtype
else anchor
= null
502 if not mt
.is_subtype
(mmodule
, anchor
, bound
) then
503 error
(nt
, "Type error: expected {bound}, got {mt}")
508 ntype
.checked_mtype
= true
515 # Flag that indicate if the class building is already completed
516 var build_classes_is_done
: Bool = false
517 # What is the AClassdef associated to a `MClass`?
518 # Used to check multiple definition of a class.
519 var mclass2nclassdef
: Map[MClass, AClassdef] = new HashMap[MClass, AClassdef]
522 redef class AClassdef
523 # The associated MClass once build by a `ModelBuilder`
524 var mclass
: nullable MClass
525 # The associated MClassDef once build by a `ModelBuilder`
526 var mclassdef
: nullable MClassDef
527 # All (self and other) definitions for the same mclassdef
528 var all_defs
: nullable Array[AClassdef]
531 redef class AClasskind
532 # The class kind associated with the AST node class
533 private fun mkind
: MClassKind is abstract
535 redef class AConcreteClasskind
536 redef fun mkind
do return concrete_kind
538 redef class AAbstractClasskind
539 redef fun mkind
do return abstract_kind
541 redef class AInterfaceClasskind
542 redef fun mkind
do return interface_kind
544 redef class AEnumClasskind
545 redef fun mkind
do return enum_kind
547 redef class AExternClasskind
548 redef fun mkind
do return extern_kind
551 redef class AFormaldef
552 # The associated parameter type
553 var mtype
: nullable MParameterType = null
555 # The associated bound
556 var bound
: nullable MType = null
560 # The mtype associated to the node
561 var mtype
: nullable MType = null
563 # Is the mtype a valid one?
564 var checked_mtype
: Bool = false