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
28 private import csv
# for live_types_to_csv
29 private import ordered_tree
# for live_methods_to_tree
31 private import more_collections
33 redef class ModelBuilder
34 # Performs a rapid-type-analysis on the program associated with `mainmodule`.
35 fun do_rapid_type_analysis
(mainmodule
: MModule): RapidTypeAnalysis
37 var analysis
= new RapidTypeAnalysis(self, mainmodule
)
40 if toolcontext
.opt_log
.value
then
41 var basename
= toolcontext
.log_directory
/ mainmodule
.name
42 analysis
.live_methods_to_tree
.write_to_file
(basename
+ ".rta_methods.txt")
43 analysis
.live_types_to_csv
.write_to_file
(basename
+ ".rta_types.csv")
50 # RapidTypeAnalysis looks for alive rapid types in application.
51 # The entry point of the analysis is the mainmodule of the application.
52 class RapidTypeAnalysis
53 # The modelbuilder used to get the AST.
54 var modelbuilder
: ModelBuilder
56 # The main module of the analysis.
57 # Used to perform types operations.
58 var mainmodule
: MModule
60 # The pool to live types.
61 # During the analysis, new types are added and combined with
62 # live_methods to determine new methoddefs to visit
63 var live_types
= new HashSet[MClassType]
65 # The pool of undesolved live types
66 # They are globally resolved at the end of the analaysis
67 var live_open_types
= new HashSet[MClassType]
69 # Live (instantiated) classes.
70 var live_classes
= new HashSet[MClass]
72 # The pool of types used to perform type checks (isa and as).
73 var live_cast_types
= new HashSet[MType]
75 # The pool of undesolved types used to perform type checks (isa and as).
76 # They are globally resolved at the end of the analaysis
77 var live_open_cast_types
= new HashSet[MType]
79 # Live method definitions.
80 var live_methoddefs
= new HashSet[MMethodDef]
83 var live_methods
= new HashSet[MMethod]
86 var live_callsites
= new HashSet[CallSite]
88 private var live_targets_cache
= new HashMap2[MType, MProperty, Set[MMethodDef]]
90 # The live targets of a specific callsite.
91 fun live_targets
(callsite
: CallSite): Set[MMethodDef]
93 var mtype
= callsite
.recv
94 var anchor
= callsite
.anchor
95 if anchor
!= null then mtype
= mtype
.anchor_to
(callsite
.mmodule
, anchor
)
96 mtype
= mtype
.undecorate
97 if mtype
isa MClassType then mtype
= mtype
.mclass
.intro
.bound_mtype
98 var mproperty
= callsite
.mproperty
99 var res
= live_targets_cache
[mtype
, mproperty
]
100 if res
!= null then return res
101 res
= new ArraySet[MMethodDef]
102 live_targets_cache
[mtype
, mproperty
] = res
104 for c
in live_classes
do
105 var tc
= c
.intro
.bound_mtype
106 if not tc
.is_subtype
(mainmodule
, null, mtype
) then continue
107 var d
= mproperty
.lookup_first_definition
(mainmodule
, tc
)
114 # Live call-to-super.
115 var live_super_sends
= new HashSet[MMethodDef]
117 # Return a ready-to-save CSV document objet that agregates informations about live types.
118 # Each discovered type is listed in a line, with its status: resolution, liveness, cast-liveness.
119 # Note: types are listed in an alphanumeric order to improve human reading.
120 fun live_types_to_csv
: CsvDocument
122 # Gather all kind of type
123 var typeset
= new HashSet[MType]
124 typeset
.add_all
(live_types
)
125 typeset
.add_all
(live_open_types
)
126 typeset
.add_all
(live_cast_types
)
127 typeset
.add_all
(live_open_cast_types
)
128 var types
= typeset
.to_a
129 (new CachedAlphaComparator).sort
(types
)
130 var res
= new CsvDocument
131 res
.format
= new CsvFormat('"', ';', "\n")
132 res
.header
= ["Type", "Resolution", "Liveness", "Cast-liveness"]
135 if t
.need_anchor
then reso
= "OPEN " else reso
= "CLOSED"
137 if t
isa MClassType and (live_types
.has
(t
) or live_open_types
.has
(t
)) then live
= "LIVE" else live
= "DEAD"
139 if live_cast_types
.has
(t
) or live_open_cast_types
.has
(t
) then cast
= "CAST LIVE" else cast
= "CAST DEAD"
140 res
.add_record
(t
, reso
, live
, cast
)
145 # Return a ready-to-save OrderedTree object that agregates infomration about live methods.
146 # Note: methods are listed in an alphanumeric order to improve human reading.
147 fun live_methods_to_tree
: OrderedTree[Object]
149 var tree
= new OrderedTree[Object]
150 for x
in live_methods
do
153 for z
in x
.mpropdefs
do
155 if live_methoddefs
.has
(z
) then
157 if live_super_sends
.has
(z
) then
158 tree
.add
(zn
, zn
+ "(super)")
160 else if live_super_sends
.has
(z
) then
161 tree
.add
(xn
, zn
+ "(super)")
165 tree
.sort_with
(alpha_comparator
)
169 # Methods that are still candidate to the try_send
170 private var totry_methods
= new HashSet[MMethod]
172 # Methods that are are no more candidate to the try_send
173 private var totry_methods_to_remove
= new Array[MMethod]
175 # Methods that are or were candidate to the try_send
176 # Used to ensure that try_send is only used once
177 private var try_methods
= new HashSet[MMethod]
179 # The method definitions that remain to visit
180 private var todo
= new List[MMethodDef]
182 private fun force_alive
(classname
: String)
184 var classes
= self.modelbuilder
.model
.get_mclasses_by_name
(classname
)
185 if classes
!= null then for c
in classes
do self.add_new
(c
.mclass_type
, c
.mclass_type
)
188 # Run the analysis until all visitable method definitions are visited.
191 var maintype
= mainmodule
.sys_type
192 if maintype
== null then return # No entry point
193 add_new
(maintype
, maintype
)
194 var initprop
= mainmodule
.try_get_primitive_method
("init", maintype
.mclass
)
195 if initprop
!= null then
196 add_send
(maintype
, initprop
)
198 var mainprop
= mainmodule
.try_get_primitive_method
("run", maintype
.mclass
) or else
199 mainmodule
.try_get_primitive_method
("main", maintype
.mclass
)
200 if mainprop
!= null then
201 add_send
(maintype
, mainprop
)
204 var finalizable_type
= mainmodule
.finalizable_type
205 if finalizable_type
!= null then
206 var finalize_meth
= mainmodule
.try_get_primitive_method
("finalize", finalizable_type
.mclass
)
207 if finalize_meth
!= null then add_send
(finalizable_type
, finalize_meth
)
210 # Force primitive types
215 force_alive
("Pointer")
217 while not todo
.is_empty
do
218 var mmethoddef
= todo
.shift
219 var mmeth
= mmethoddef
.mproperty
220 #print "# visit {mmethoddef}"
221 var v
= new RapidTypeVisitor(self, mmethoddef
.mclassdef
.bound_mtype
, mmethoddef
)
223 var vararg_rank
= mmethoddef
.msignature
.vararg_rank
224 if vararg_rank
> -1 then
225 var node
= self.modelbuilder
.mpropdef2node
(mmethoddef
)
226 var elttype
= mmethoddef
.msignature
.mparameters
[vararg_rank
].mtype
227 #elttype = elttype.anchor_to(self.mainmodule, v.receiver)
228 var vararg
= self.mainmodule
.array_type
(elttype
)
230 var native
= self.mainmodule
.native_array_type
(elttype
)
232 v
.add_monomorphic_send
(vararg
, self.modelbuilder
.force_get_primitive_method
(node
, "with_native", vararg
.mclass
, self.mainmodule
))
235 # TODO? new_msignature
236 var sig
= mmethoddef
.msignature
.as(not null)
237 var osig
= mmeth
.intro
.msignature
.as(not null)
238 for i
in [0..sig
.arity
[ do
239 var origtype
= osig
.mparameters
[i
].mtype
240 if not origtype
.need_anchor
then continue # skip non covariant stuff
241 var paramtype
= sig
.mparameters
[i
].mtype
245 var npropdef
= modelbuilder
.mpropdef2node
(mmethoddef
)
247 if npropdef
isa AClassdef then
248 # It is an init for a class
249 assert mmethoddef
== npropdef
.mfree_init
251 if mmethoddef
.mproperty
.is_root_init
and not mmethoddef
.is_intro
then
252 self.add_super_send
(v
.receiver
, mmethoddef
)
255 else if mmethoddef
.constant_value
!= null then
256 # Make the return type live
257 v
.add_type
(mmethoddef
.msignature
.return_mtype
.as(MClassType))
259 else if npropdef
== null then
263 if npropdef
isa AMethPropdef then
264 var auto_super_inits
= npropdef
.auto_super_inits
265 if auto_super_inits
!= null then
266 for auto_super_init
in auto_super_inits
do
267 v
.add_callsite
(auto_super_init
)
270 if npropdef
.auto_super_call
then
271 self.add_super_send
(v
.receiver
, mmethoddef
)
275 if mmethoddef
.is_intern
or mmethoddef
.is_extern
then
276 # UGLY: We force the "instantation" of the concrete return type if any
277 var ret
= mmethoddef
.msignature
.return_mtype
278 if ret
!= null and ret
isa MClassType and ret
.mclass
.kind
!= abstract_kind
and ret
.mclass
.kind
!= interface_kind
then
283 v
.enter_visit
(npropdef
)
286 #print "MMethod {live_methods.length}: {live_methods.join(", ")}"
287 #print "MMethodDef {live_methoddefs.length}: {live_methoddefs.join(", ")}"
289 #print "open MType {live_open_types.length}: {live_open_types.join(", ")}"
290 var todo_types
= new List[MClassType]
291 todo_types
.add_all
(live_types
)
292 while not todo_types
.is_empty
do
293 var t
= todo_types
.shift
294 for ot
in live_open_types
do
296 if not ot
.can_resolve_for
(t
, t
, mainmodule
) then continue
297 var rt
= ot
.anchor_to
(mainmodule
, t
)
298 if live_types
.has
(rt
) then continue
299 if not check_depth
(rt
) then continue
300 #print "{ot}/{t} -> {rt}"
305 #print "MType {live_types.length}: {live_types.join(", ")}"
307 #print "open cast MType {live_open_cast_types.length}: {live_open_cast_types.join(", ")}"
308 for ot
in live_open_cast_types
do
309 #print "live_open_cast_type: {ot}"
310 for t
in live_types
do
311 if not ot
.can_resolve_for
(t
, t
, mainmodule
) then continue
312 var rt
= ot
.anchor_to
(mainmodule
, t
)
313 live_cast_types
.add
(rt
)
314 #print " {ot}/{t} -> {rt}"
317 #print "cast MType {live_cast_types.length}: {live_cast_types.join(", ")}"
320 private fun check_depth
(mtype
: MClassType): Bool
324 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}`.")
330 fun add_new
(recv
: MClassType, mtype
: MClassType)
332 assert not recv
.need_anchor
333 if mtype
.need_anchor
then
334 if live_open_types
.has
(mtype
) then return
335 live_open_types
.add
(mtype
)
337 if live_types
.has
(mtype
) then return
338 live_types
.add
(mtype
)
341 var mclass
= mtype
.mclass
342 if live_classes
.has
(mclass
) then return
343 live_classes
.add
(mclass
)
345 for p
in totry_methods
do try_send
(mtype
, p
)
346 for p
in live_super_sends
do try_super_send
(mtype
, p
)
348 # Remove cleared ones
349 for p
in totry_methods_to_remove
do totry_methods
.remove
(p
)
350 totry_methods_to_remove
.clear
352 var bound_mtype
= mtype
.anchor_to
(mainmodule
, recv
)
353 for cd
in bound_mtype
.collect_mclassdefs
(mainmodule
)
355 for npropdef
in modelbuilder
.collect_attr_propdef
(cd
) do
356 if not npropdef
.has_value
then continue
358 var mpropdef
= npropdef
.mpropdef
.as(not null)
359 var v
= new RapidTypeVisitor(self, bound_mtype
, mpropdef
)
360 v
.enter_visit
(npropdef
.n_expr
)
361 v
.enter_visit
(npropdef
.n_block
)
367 fun add_cast
(mtype
: MType)
369 if mtype
.need_anchor
then
370 live_open_cast_types
.add
(mtype
)
372 live_cast_types
.add
(mtype
)
376 fun try_send
(recv
: MClassType, mproperty
: MMethod)
378 recv
= recv
.mclass
.intro
.bound_mtype
379 if not recv
.has_mproperty
(mainmodule
, mproperty
) then return
380 var d
= mproperty
.lookup_first_definition
(mainmodule
, recv
)
384 fun add_call
(mpropdef
: MMethodDef)
386 if live_methoddefs
.has
(mpropdef
) then return
387 live_methoddefs
.add
(mpropdef
)
390 var mproperty
= mpropdef
.mproperty
391 if mproperty
.mpropdefs
.length
<= 1 then return
392 # If all definitions of a method are live, we can remove the definition of the totry set
393 for d
in mproperty
.mpropdefs
do
394 if not live_methoddefs
.has
(d
) then return
396 #print "full property: {mpropdef.mproperty} for {mpropdef.mproperty.mpropdefs.length} definitions"
397 totry_methods_to_remove
.add
(mpropdef
.mproperty
)
400 fun add_send
(recv
: MType, mproperty
: MMethod)
402 if try_methods
.has
(mproperty
) then return
403 #print "new prop: {mproperty}"
404 live_methods
.add
(mproperty
)
405 try_methods
.add
(mproperty
)
406 if mproperty
.mpropdefs
.length
== 1 then
407 # If there is only one definition, just add the definition and do not try again the property
408 var d
= mproperty
.mpropdefs
.first
412 # Else, the property is potentially called with various reciever
413 # So just try the methods with existing receiver and register it for future receiver
414 totry_methods
.add
(mproperty
)
415 for c
in live_classes
do
416 try_send
(c
.intro
.bound_mtype
, mproperty
)
420 fun try_super_send
(recv
: MClassType, mpropdef
: MMethodDef)
422 recv
= recv
.mclass
.intro
.bound_mtype
423 if not recv
.collect_mclassdefs
(mainmodule
).has
(mpropdef
.mclassdef
) then return
424 var d
= mpropdef
.lookup_next_definition
(mainmodule
, recv
)
428 fun add_super_send
(recv
: MType, mpropdef
: MMethodDef)
430 assert mpropdef
.has_supercall
431 if live_super_sends
.has
(mpropdef
) then return
432 #print "new super prop: {mpropdef}"
433 live_super_sends
.add
(mpropdef
)
434 for c
in live_classes
do
435 try_super_send
(c
.intro
.bound_mtype
, mpropdef
)
440 class RapidTypeVisitor
443 var analysis
: RapidTypeAnalysis
444 var receiver
: MClassType
445 var mpropdef
: MPropDef
449 assert not receiver
.need_anchor
454 n
.accept_rapid_type_visitor
(self)
456 var implicit_cast_to
= n
.implicit_cast_to
457 if implicit_cast_to
!= null then self.add_cast_type
(implicit_cast_to
)
460 # RTA does not enter in AAnnotations
461 if not n
isa AAnnotations then
466 fun cleanup_type
(mtype
: MType): nullable MClassType
468 mtype
= mtype
.anchor_to
(self.analysis
.mainmodule
, self.receiver
)
469 if mtype
isa MNullType then return null
470 mtype
= mtype
.undecorate
471 assert mtype
isa MClassType
472 assert not mtype
.need_anchor
476 fun get_method
(recv
: MType, name
: String): MMethod
478 var mtype
= cleanup_type
(recv
)
480 return self.analysis
.modelbuilder
.force_get_primitive_method
(self.current_node
.as(not null), name
, mtype
.mclass
, self.analysis
.mainmodule
)
483 fun add_type
(mtype
: MClassType) do analysis
.add_new
(receiver
, mtype
)
485 fun add_monomorphic_send
(mtype
: MType, mproperty
: MMethod)
487 analysis
.live_methods
.add
(mproperty
)
488 analysis
.try_send
(mtype
.as(MClassType), mproperty
)
491 fun add_send
(mtype
: MType, mproperty
: MMethod) do analysis
.add_send
(mtype
, mproperty
)
493 fun add_cast_type
(mtype
: MType) do analysis
.add_cast
(mtype
)
495 fun add_callsite
(callsite
: nullable CallSite) do if callsite
!= null then
496 for m
in callsite
.mpropdef
.initializers
do
497 if m
isa MMethod then
498 analysis
.add_send
(callsite
.recv
, m
)
501 analysis
.add_send
(callsite
.recv
, callsite
.mproperty
)
502 analysis
.live_callsites
.add
(callsite
)
509 private fun accept_rapid_type_visitor
(v
: RapidTypeVisitor)
515 redef fun accept_rapid_type_visitor
(v
)
517 v
.add_type
(self.mtype
.as(MClassType))
521 redef class AFloatExpr
522 redef fun accept_rapid_type_visitor
(v
)
524 v
.add_type
(self.mtype
.as(MClassType))
528 redef class ACharExpr
529 redef fun accept_rapid_type_visitor
(v
)
531 v
.add_type
(self.mtype
.as(MClassType))
535 redef class AArrayExpr
536 redef fun accept_rapid_type_visitor
(v
)
538 var mtype
= self.mtype
.as(MClassType)
540 var native
= v
.analysis
.mainmodule
.native_array_type
(mtype
.arguments
.first
)
542 mtype
= v
.cleanup_type
(mtype
).as(not null)
543 var prop
= v
.get_method
(mtype
, "with_native")
544 v
.add_monomorphic_send
(mtype
, prop
)
545 v
.add_callsite
(with_capacity_callsite
)
546 v
.add_callsite
(push_callsite
)
550 redef class AStringFormExpr
551 redef fun accept_rapid_type_visitor
(v
)
553 var native
= v
.analysis
.mainmodule
.native_string_type
555 var prop
= v
.get_method
(native
, "to_s_with_length")
556 v
.add_monomorphic_send
(native
, prop
)
560 redef class ASuperstringExpr
561 redef fun accept_rapid_type_visitor
(v
)
563 var mmodule
= v
.analysis
.mainmodule
564 var object_type
= mmodule
.object_type
565 var arraytype
= mmodule
.array_type
(object_type
)
566 v
.add_type
(arraytype
)
567 var nattype
= mmodule
.native_array_type
(object_type
)
569 var prop
= v
.get_method
(arraytype
, "join")
570 v
.add_monomorphic_send
(arraytype
, prop
)
571 var prop2
= v
.get_method
(arraytype
, "with_native")
572 v
.add_monomorphic_send
(arraytype
, prop2
)
573 v
.add_monomorphic_send
(nattype
, v
.get_method
(nattype
, "native_to_s"))
577 redef class ACrangeExpr
578 redef fun accept_rapid_type_visitor
(v
)
580 var mtype
= self.mtype
.as(MClassType)
582 v
.add_callsite
(init_callsite
)
586 redef class AOrangeExpr
587 redef fun accept_rapid_type_visitor
(v
)
589 var mtype
= self.mtype
.as(MClassType)
591 v
.add_callsite
(init_callsite
)
595 redef class ATrueExpr
596 redef fun accept_rapid_type_visitor
(v
)
598 v
.add_type
(self.mtype
.as(MClassType))
602 redef class AFalseExpr
603 redef fun accept_rapid_type_visitor
(v
)
605 v
.add_type
(self.mtype
.as(MClassType))
610 redef fun accept_rapid_type_visitor
(v
)
612 v
.add_cast_type
(self.cast_type
.as(not null))
616 redef class AAsCastExpr
617 redef fun accept_rapid_type_visitor
(v
)
619 v
.add_cast_type
(self.mtype
.as(not null))
623 redef class ASendExpr
624 redef fun accept_rapid_type_visitor
(v
)
626 v
.add_callsite
(callsite
)
631 redef class ASendReassignFormExpr
632 redef fun accept_rapid_type_visitor
(v
)
634 v
.add_callsite
(callsite
)
635 v
.add_callsite
(reassign_callsite
)
636 v
.add_callsite
(write_callsite
)
640 redef class AVarReassignExpr
641 redef fun accept_rapid_type_visitor
(v
)
643 v
.add_callsite
(reassign_callsite
)
647 redef class AAttrReassignExpr
648 redef fun accept_rapid_type_visitor
(v
)
650 v
.add_callsite
(reassign_callsite
)
654 redef class ASuperExpr
655 redef fun accept_rapid_type_visitor
(v
)
657 var callsite
= self.callsite
658 if callsite
!= null then
659 v
.add_callsite
(callsite
)
663 v
.analysis
.add_super_send
(v
.receiver
, mpropdef
.as(not null))
668 redef fun accept_rapid_type_visitor
(v
)
670 v
.add_callsite
(self.method_iterator
)
671 v
.add_callsite
(self.method_is_ok
)
672 if self.variables
.length
== 1 then
673 v
.add_callsite
(self.method_item
)
674 else if self.variables
.length
== 2 then
675 v
.add_callsite
(self.method_key
)
676 v
.add_callsite
(self.method_item
)
680 v
.add_callsite
(self.method_next
)
681 var mf
= self.method_finish
682 if mf
!= null then v
.add_callsite
(mf
)
687 redef fun accept_rapid_type_visitor
(v
)
689 var mtype
= self.recvtype
.as(not null)
691 v
.add_callsite
(callsite
)