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.
18 # Rapid type analysis on the AST
20 # Rapid type analysis is an analyse that aproximates the set of live classes
21 # and the set of live methods starting from the entry point of the program.
22 # These two sets are interdependant and computed together.
23 # It is quite efficient but the type set is global and pollutes each call site.
24 module rapid_type_analysis
29 import auto_super_init
31 redef class ModelBuilder
32 fun do_rapid_type_analysis
(mainmodule
: MModule): RapidTypeAnalysis
34 var analysis
= new RapidTypeAnalysis(self, mainmodule
)
40 # RapidTypeAnalysis looks for alive rapid types in application.
41 # The entry point of the analysis is the mainmodule of the application.
42 class RapidTypeAnalysis
43 # The modelbuilder used to get the AST.
44 var modelbuilder
: ModelBuilder
46 # The main module of the analysis.
47 # Used to perform types operations.
48 var mainmodule
: MModule
50 # The pool to live types.
51 # During the analysis, new types are added and combined with
52 # live_methods to determine new methoddefs to visit
53 var live_types
= new HashSet[MClassType]
55 # The pool of undesolved live types
56 # They are globally resolved at the end of the analaysis
57 var live_open_types
= new HashSet[MClassType]
59 # Live (instantiated) classes.
60 var live_classes
= new HashSet[MClass]
62 # The pool of types used to perform type checks (isa and as).
63 var live_cast_types
= new HashSet[MType]
65 # The pool of undesolved types used to perform type checks (isa and as).
66 # They are globally resolved at the end of the analaysis
67 var live_open_cast_types
= new HashSet[MType]
69 # Live method definitions.
70 var live_methoddefs
= new HashSet[MMethodDef]
73 var live_methods
= new HashSet[MMethod]
76 var live_super_sends
= new HashSet[MMethodDef]
78 # Methods that are are still candidate to the try_send
79 private var totry_methods
= new HashSet[MMethod]
81 # The method definitions that remain to visit
82 private var todo
= new List[MMethodDef]
84 private fun force_alive
(classname
: String)
86 var classes
= self.modelbuilder
.model
.get_mclasses_by_name
(classname
)
87 if classes
!= null then for c
in classes
do self.add_new
(c
.mclass_type
, c
.mclass_type
)
90 # Run the analysis until all visitable method definitions are visited.
93 var maintype
= mainmodule
.sys_type
94 if maintype
== null then return # No entry point
95 add_new
(maintype
, maintype
)
96 var initprop
= mainmodule
.try_get_primitive_method
("init", maintype
.mclass
)
97 if initprop
!= null then
98 add_send
(maintype
, initprop
)
100 var mainprop
= mainmodule
.try_get_primitive_method
("main", maintype
.mclass
)
101 if mainprop
!= null then
102 add_send
(maintype
, mainprop
)
105 # Force primitive types
111 while not todo
.is_empty
do
112 var mmethoddef
= todo
.shift
113 #print "# visit {mmethoddef}"
114 var v
= new RapidTypeVisitor(self, mmethoddef
.mclassdef
.bound_mtype
, mmethoddef
)
116 var vararg_rank
= mmethoddef
.msignature
.vararg_rank
117 if vararg_rank
> -1 then
118 var node
= self.modelbuilder
.mpropdef2npropdef
[mmethoddef
]
119 var elttype
= mmethoddef
.msignature
.mparameters
[vararg_rank
].mtype
120 #elttype = elttype.anchor_to(self.mainmodule, v.receiver)
121 var vararg
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
123 var native
= self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
])
125 v
.add_monomorphic_send
(vararg
, self.modelbuilder
.force_get_primitive_method
(node
, "with_native", vararg
.mclass
, self.mainmodule
))
129 for i
in [0..mmethoddef
.msignature
.arity
[ do
130 var origtype
= mmethoddef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
131 if not origtype
.need_anchor
then continue # skip non covariant stuff
132 var paramtype
= mmethoddef
.msignature
.mparameters
[i
].mtype
133 #paramtype = v.cleanup_type(paramtype).as(not null)
137 if not modelbuilder
.mpropdef2npropdef
.has_key
(mmethoddef
) then
138 # It is an init for a class?
139 if mmethoddef
.mproperty
.name
== "init" then
140 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mmethoddef
.mclassdef
]
141 var super_inits
= nclassdef
.super_inits
142 if super_inits
!= null then
143 #assert args.length == 1
144 for su
in super_inits
do
145 v
.add_monomorphic_send
(v
.receiver
, su
)
155 var npropdef
= modelbuilder
.mpropdef2npropdef
[mmethoddef
]
157 if npropdef
isa AConcreteMethPropdef then
158 var auto_super_inits
= npropdef
.auto_super_inits
159 if auto_super_inits
!= null then
160 for auto_super_init
in auto_super_inits
do
161 v
.add_callsite
(auto_super_init
)
164 else if npropdef
isa AInternMethPropdef or
165 (npropdef
isa AExternMethPropdef and npropdef
.n_extern
!= null) then
166 # UGLY: We force the "instantation" of the concrete return type if any
167 var ret
= mmethoddef
.msignature
.return_mtype
168 if ret
!= null and ret
isa MClassType and ret
.mclass
.kind
!= abstract_kind
and ret
.mclass
.kind
!= interface_kind
then
171 else if npropdef
isa AExternMethPropdef then
172 var nclassdef
= npropdef
.parent
.as(AClassdef)
173 v
.enter_visit
(npropdef
)
174 else if npropdef
isa AExternInitPropdef then
175 v
.add_type
(v
.receiver
)
180 v
.enter_visit
(npropdef
)
183 #print "MMethod {live_methods.length}: {live_methods.join(", ")}"
184 #print "MMethodDef {live_methoddefs.length}: {live_methoddefs.join(", ")}"
186 #print "open MType {live_open_types.length}: {live_open_types.join(", ")}"
187 var todo_types
= new List[MClassType]
188 todo_types
.add_all
(live_types
)
189 while not todo_types
.is_empty
do
190 var t
= todo_types
.shift
191 for ot
in live_open_types
do
193 if not ot
.can_resolve_for
(t
, t
, mainmodule
) then continue
194 var rt
= ot
.anchor_to
(mainmodule
, t
)
195 if live_types
.has
(rt
) then continue
196 #print "{ot}/{t} -> {rt}"
202 #print "MType {live_types.length}: {live_types.join(", ")}"
204 #print "open cast MType {live_open_cast_types.length}: {live_open_cast_types.join(", ")}"
205 for ot
in live_open_cast_types
do
206 #print "live_open_cast_type: {ot}"
207 for t
in live_types
do
208 if not ot
.can_resolve_for
(t
, t
, mainmodule
) then continue
209 var rt
= ot
.anchor_to
(mainmodule
, t
)
210 live_cast_types
.add
(rt
)
211 #print " {ot}/{t} -> {rt}"
214 #print "cast MType {live_cast_types.length}: {live_cast_types.join(", ")}"
217 private fun check_depth
(mtype
: MClassType)
221 self.modelbuilder
.toolcontext
.fatal_error
(null, "Fatal error: limitation in the rapidtype analysis engine: a type depth of {d} is too important, the problematic type is {mtype}.")
225 fun add_new
(recv
: MClassType, mtype
: MClassType)
227 assert not recv
.need_anchor
228 if mtype
.need_anchor
then
229 if live_open_types
.has
(mtype
) then return
230 live_open_types
.add
(mtype
)
232 if live_types
.has
(mtype
) then return
233 live_types
.add
(mtype
)
236 var mclass
= mtype
.mclass
237 if live_classes
.has
(mclass
) then return
238 live_classes
.add
(mclass
)
240 for p
in totry_methods
do try_send
(mtype
, p
)
241 for p
in live_super_sends
do try_super_send
(mtype
, p
)
243 var bound_mtype
= mtype
.anchor_to
(mainmodule
, recv
)
244 for cd
in bound_mtype
.collect_mclassdefs
(mainmodule
)
246 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
247 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
248 for npropdef
in nclassdef
.n_propdefs
do
249 if not npropdef
isa AAttrPropdef then continue
250 var nexpr
= npropdef
.n_expr
251 if nexpr
== null then continue
252 var mpropdef
= npropdef
.mpropdef
.as(not null)
253 var v
= new RapidTypeVisitor(self, bound_mtype
, mpropdef
)
260 fun add_cast
(mtype
: MType)
262 if mtype
.need_anchor
then
263 live_open_cast_types
.add
(mtype
)
265 live_cast_types
.add
(mtype
)
269 fun try_send
(recv
: MClassType, mproperty
: MMethod)
271 recv
= recv
.mclass
.intro
.bound_mtype
272 if not recv
.has_mproperty
(mainmodule
, mproperty
) then return
273 var d
= mproperty
.lookup_first_definition
(mainmodule
, recv
)
277 fun add_call
(mpropdef
: MMethodDef)
279 if live_methoddefs
.has
(mpropdef
) then return
280 live_methoddefs
.add
(mpropdef
)
283 var mproperty
= mpropdef
.mproperty
284 if mproperty
.mpropdefs
.length
<= 1 then return
285 # If all definitions of a method are live, we can remove the definition of the totry set
286 for d
in mproperty
.mpropdefs
do
287 if d
.is_abstract
then continue
288 if not live_methoddefs
.has
(d
) then return
290 #print "full property: {mpropdef.mproperty} for {mpropdef.mproperty.mpropdefs.length} definitions"
291 totry_methods
.remove
(mpropdef
.mproperty
)
294 fun add_send
(recv
: MType, mproperty
: MMethod)
296 if live_methods
.has
(mproperty
) then return
297 #print "new prop: {mproperty}"
298 live_methods
.add
(mproperty
)
299 if mproperty
.mpropdefs
.length
== 1 then
300 # If there is only one definition, just add the definition and do not try again the property
301 var d
= mproperty
.mpropdefs
.first
305 # Else, the property is potentially called with various reciever
306 # So just try the methods with existing receiver and register it for future receiver
307 totry_methods
.add
(mproperty
)
308 for c
in live_classes
do
309 try_send
(c
.intro
.bound_mtype
, mproperty
)
313 fun try_super_send
(recv
: MClassType, mpropdef
: MMethodDef)
315 recv
= recv
.mclass
.intro
.bound_mtype
316 if not recv
.collect_mclassdefs
(mainmodule
).has
(mpropdef
.mclassdef
) then return
317 var d
= mpropdef
.lookup_next_definition
(mainmodule
, recv
)
321 fun add_super_send
(recv
: MType, mpropdef
: MMethodDef)
323 if live_super_sends
.has
(mpropdef
) then return
324 #print "new super prop: {mpropdef}"
325 live_super_sends
.add
(mpropdef
)
326 for t
in live_types
do
327 try_super_send
(t
, mpropdef
)
332 class RapidTypeVisitor
335 var analysis
: RapidTypeAnalysis
336 var receiver
: MClassType
337 var mpropdef
: MPropDef
339 init(analysis
: RapidTypeAnalysis, receiver
: MClassType, mpropdef
: MPropDef)
341 self.analysis
= analysis
342 self.receiver
= receiver
343 self.mpropdef
= mpropdef
344 assert not receiver
.need_anchor
349 n
.accept_rapid_type_visitor
(self)
351 var implicit_cast_to
= n
.implicit_cast_to
352 if implicit_cast_to
!= null then self.add_cast_type
(implicit_cast_to
)
355 # RTA does not enter in AAnnotations
356 if not n
isa AAnnotations then
361 fun cleanup_type
(mtype
: MType): nullable MClassType
363 mtype
= mtype
.anchor_to
(self.analysis
.mainmodule
, self.receiver
)
364 if mtype
isa MNullType then return null
365 if mtype
isa MNullableType then mtype
= mtype
.mtype
366 assert mtype
isa MClassType
367 assert not mtype
.need_anchor
371 fun get_class
(name
: String): MClass
373 return analysis
.mainmodule
.get_primitive_class
(name
)
376 fun get_method
(recv
: MType, name
: String): MMethod
378 var mtype
= cleanup_type
(recv
)
380 return self.analysis
.modelbuilder
.force_get_primitive_method
(self.current_node
.as(not null), name
, mtype
.mclass
, self.analysis
.mainmodule
)
383 fun add_type
(mtype
: MClassType) do analysis
.add_new
(receiver
, mtype
)
385 fun add_monomorphic_send
(mtype
: MType, mproperty
: MMethod) do analysis
.try_send
(mtype
.as(MClassType), mproperty
)
387 fun add_send
(mtype
: MType, mproperty
: MMethod) do analysis
.add_send
(mtype
, mproperty
)
389 fun add_cast_type
(mtype
: MType) do analysis
.add_cast
(mtype
)
391 fun add_callsite
(callsite
: nullable CallSite) do if callsite
!= null then analysis
.add_send
(callsite
.recv
, callsite
.mproperty
)
397 private fun accept_rapid_type_visitor
(v
: RapidTypeVisitor)
403 redef fun accept_rapid_type_visitor
(v
)
405 v
.add_type
(self.mtype
.as(MClassType))
409 redef class AFloatExpr
410 redef fun accept_rapid_type_visitor
(v
)
412 v
.add_type
(self.mtype
.as(MClassType))
416 redef class ACharExpr
417 redef fun accept_rapid_type_visitor
(v
)
419 v
.add_type
(self.mtype
.as(MClassType))
423 redef class AArrayExpr
424 redef fun accept_rapid_type_visitor
(v
)
426 var mtype
= self.mtype
.as(MClassType)
428 var native
= v
.analysis
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
.arguments
.first
])
430 mtype
= v
.cleanup_type
(mtype
).as(not null)
431 var prop
= v
.get_method
(mtype
, "with_native")
432 v
.add_monomorphic_send
(mtype
, prop
)
436 redef class AStringFormExpr
437 redef fun accept_rapid_type_visitor
(v
)
439 var native
= v
.get_class
("NativeString").mclass_type
441 var prop
= v
.get_method
(native
, "to_s_with_length")
442 v
.add_monomorphic_send
(native
, prop
)
446 redef class ASuperstringExpr
447 redef fun accept_rapid_type_visitor
(v
)
449 var arraytype
= v
.get_class
("Array").get_mtype
([v
.get_class
("Object").mclass_type
])
450 v
.add_type
(arraytype
)
451 v
.add_type
(v
.get_class
("NativeArray").get_mtype
([v
.get_class
("Object").mclass_type
]))
452 var prop
= v
.get_method
(arraytype
, "join")
453 v
.add_monomorphic_send
(arraytype
, prop
)
454 var prop2
= v
.get_method
(arraytype
, "with_native")
455 v
.add_monomorphic_send
(arraytype
, prop2
)
459 redef class ACrangeExpr
460 redef fun accept_rapid_type_visitor
(v
)
462 var mtype
= self.mtype
.as(MClassType)
464 var prop
= v
.get_method
(mtype
, "init")
465 v
.add_monomorphic_send
(mtype
, prop
)
469 redef class AOrangeExpr
470 redef fun accept_rapid_type_visitor
(v
)
472 var mtype
= self.mtype
.as(MClassType)
474 var prop
= v
.get_method
(mtype
, "without_last")
475 v
.add_monomorphic_send
(mtype
, prop
)
479 redef class ATrueExpr
480 redef fun accept_rapid_type_visitor
(v
)
482 v
.add_type
(self.mtype
.as(MClassType))
486 redef class AFalseExpr
487 redef fun accept_rapid_type_visitor
(v
)
489 v
.add_type
(self.mtype
.as(MClassType))
494 redef fun accept_rapid_type_visitor
(v
)
496 v
.add_cast_type
(self.cast_type
.as(not null))
500 redef class AAsCastExpr
501 redef fun accept_rapid_type_visitor
(v
)
503 v
.add_cast_type
(self.mtype
.as(not null))
507 redef class ASendExpr
508 redef fun accept_rapid_type_visitor
(v
)
510 v
.add_callsite
(callsite
)
515 redef class ASendReassignFormExpr
516 redef fun accept_rapid_type_visitor
(v
)
518 v
.add_callsite
(callsite
)
519 v
.add_callsite
(reassign_callsite
)
520 v
.add_callsite
(write_callsite
)
524 redef class AVarReassignExpr
525 redef fun accept_rapid_type_visitor
(v
)
527 v
.add_callsite
(reassign_callsite
)
531 redef class AAttrReassignExpr
532 redef fun accept_rapid_type_visitor
(v
)
534 v
.add_callsite
(reassign_callsite
)
538 redef class ASuperExpr
539 redef fun accept_rapid_type_visitor
(v
)
541 var callsite
= self.callsite
542 if callsite
!= null then
543 v
.add_callsite
(callsite
)
547 v
.analysis
.add_super_send
(v
.receiver
, v
.mpropdef
.as(MMethodDef))
552 redef fun accept_rapid_type_visitor
(v
)
554 var recvtype
= self.n_expr
.mtype
.as(not null)
555 var colltype
= self.coltype
.as(not null)
556 var itmeth
= v
.get_method
(colltype
, "iterator")
557 v
.add_send
(recvtype
, itmeth
)
558 var iteratortype
= itmeth
.intro
.msignature
.return_mtype
.as(MClassType).mclass
.intro
.bound_mtype
559 var objtype
= v
.get_class
("Object").mclass_type
560 v
.add_send
(objtype
, v
.get_method
(iteratortype
, "is_ok"))
561 if self.variables
.length
== 1 then
562 v
.add_send
(objtype
, v
.get_method
(iteratortype
, "item"))
563 else if self.variables
.length
== 2 then
564 v
.add_send
(objtype
, v
.get_method
(iteratortype
, "key"))
565 v
.add_send
(objtype
, v
.get_method
(iteratortype
, "item"))
569 v
.add_send
(objtype
, v
.get_method
(iteratortype
, "next"))
574 redef fun accept_rapid_type_visitor
(v
)
576 var mtype
= self.mtype
.as(MClassType)
578 v
.add_callsite
(callsite
)