-
Notifications
You must be signed in to change notification settings - Fork 393
/
OMRBlock.cpp
2823 lines (2528 loc) · 110 KB
/
OMRBlock.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*******************************************************************************
* Copyright IBM Corp. and others 2000
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at http://eclipse.org/legal/epl-2.0
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include "il/Block.hpp"
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "compile/Compilation.hpp"
#include "compile/CompilationTypes.hpp"
#include "compile/Method.hpp"
#include "compile/ResolvedMethod.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/CompilerEnv.hpp"
#include "env/StackMemoryRegion.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.hpp"
#include "il/AutomaticSymbol.hpp"
#include "il/Block.hpp"
#include "il/Block_inlines.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/LabelSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/RegisterMappedSymbol.hpp"
#include "il/ResolvedMethodSymbol.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Array.hpp"
#include "infra/Assert.hpp"
#include "infra/BitVector.hpp"
#include "infra/Cfg.hpp"
#include "infra/Flags.hpp"
#include "infra/ILWalk.hpp"
#include "infra/Link.hpp"
#include "infra/List.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/CfgNode.hpp"
#include "optimizer/Inliner.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/RegisterCandidate.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/TransformUtil.hpp"
#include "optimizer/GlobalRegister.hpp"
#include "optimizer/GlobalRegister_inlines.hpp"
#include "ras/Debug.hpp"
class TR_Memory;
namespace TR { class DebugCounterAggregation; }
namespace TR { class Instruction; }
TR::Block *
OMR::Block::createEmptyBlock(TR::Compilation *comp, int32_t frequency, TR::Block *block)
{
if (!comp->isPeekingMethod() && (comp->getFlowGraph()->getMaxFrequency() >= 0))
TR_ASSERT((frequency >= 0), "Block frequency must be non negative\n");
return TR::Block::createEmptyBlock(0, comp, frequency, block);
}
TR::Block *
OMR::Block::asBlock() { return self(); }
OMR::Block::Block(TR_Memory * m) :
TR::CFGNode(m)
{
self()->init(NULL, NULL);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
}
OMR::Block::Block(TR::CFG &cfg) :
TR::CFGNode(cfg.getInternalMemoryRegion())
{
self()->init(NULL, NULL);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
}
OMR::Block::Block(TR::TreeTop *entry, TR::TreeTop *exit, TR_Memory * m) :
TR::CFGNode(m)
{
self()->init(entry, exit);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
if (entry && entry->getNode()) entry->getNode()->setBlock(self());
if (exit && exit->getNode()) exit->getNode()->setBlock(self());
}
OMR::Block::Block(TR::TreeTop *entry, TR::TreeTop *exit, TR::CFG &cfg) :
TR::CFGNode(cfg.getInternalMemoryRegion())
{
self()->init(entry, exit);
self()->setFrequency(-1);
self()->setUnrollFactor(0);
if (entry && entry->getNode()) entry->getNode()->setBlock(self());
if (exit && exit->getNode()) exit->getNode()->setBlock(self());
}
void
OMR::Block::init(TR::TreeTop *entry, TR::TreeTop *exit)
{
_pEntry = entry;
_pExit = exit;
_pStructureOf = NULL;
_liveLocals = NULL;
_globalRegisters = 0;
_catchBlockExtension = NULL;
_firstInstruction = NULL;
_lastInstruction = NULL;
_blockSize = -1;
_debugCounters = NULL;
_flags = 0;
_moreflags = 0;
}
TR::Block*
OMR::Block::createBlock(TR::TreeTop *entry, TR::TreeTop *exit, TR::CFG &cfg)
{
return new (cfg.getInternalMemoryRegion()) TR::Block(entry, exit, cfg);
}
/// Copy constructor
OMR::Block::Block(TR::Block &other, TR::TreeTop *entry, TR::TreeTop *exit) :
TR::CFGNode(other._region),
_pEntry(entry),
_pExit(exit),
_pStructureOf(NULL),
_liveLocals(NULL),
_globalRegisters(0),
_firstInstruction(other._firstInstruction),
_lastInstruction(other._lastInstruction),
_blockSize(other._blockSize),
_debugCounters(other._debugCounters),
_catchBlockExtension(NULL)
{
if (entry && entry->getNode()) entry->getNode()->setBlock(self());
if (exit && exit->getNode()) exit->getNode()->setBlock(self());
if (other._liveLocals)
_liveLocals = new (other._region) TR_BitVector(*other._liveLocals);
if (other._catchBlockExtension)
{
_catchBlockExtension = new (other._region)
TR_CatchBlockExtension(*other._catchBlockExtension);
}
self()->setFrequency(other.getFrequency());
if (other._globalRegisters)
_globalRegisters = new (other._region) TR_Array<TR::GlobalRegister>(*other._globalRegisters);
_flags.set(other._flags.getValue());
_moreflags.set(other._moreflags.getValue());
_unrollFactor = other.getUnrollFactor();
}
TR::Block *
OMR::Block::getNextBlock()
{
TR::TreeTop * t = _pExit->getNextTreeTop();
return t ? t->getNode()->getBlock() : 0;
}
TR::Block *
OMR::Block::getPrevBlock()
{
TR::TreeTop * t = _pEntry->getPrevTreeTop();
return t ? t->getNode()->getBlock() : 0;
}
TR::Block *
OMR::Block::getNextExtendedBlock()
{
TR::Block * b = self()->getNextBlock();
for (; b && b->isExtensionOfPreviousBlock(); b = b->getNextBlock())
;
return b;
}
// append a node under a treetop and before the bbend
TR::TreeTop *
OMR::Block::append(TR::TreeTop * tt)
{
return self()->getExit()->insertBefore(tt);
}
/**
* Prepend a OMR::Block::node under a treetop immediately after the bbStart
*/
TR::TreeTop *
OMR::Block::prepend(TR::TreeTop * tt)
{
return self()->getEntry()->insertAfter(tt);
}
TR::TreeTop *
OMR::Block::getFirstRealTreeTop()
{
TR_ASSERT(self()->getEntry() && self()->getEntry()->getNextTreeTop(), "Block must have valid entry treetop\n");
TR::TreeTop * tt = self()->getEntry()->getNextTreeTop();
while (tt->getNode()->getOpCode().isExceptionRangeFence())
tt = tt->getNextTreeTop();
return tt;
}
TR::TreeTop *
OMR::Block::getLastRealTreeTop()
{
TR_ASSERT(self()->getExit() && self()->getExit()->getPrevTreeTop(), "Block must have valid exit treetop\n");
TR::TreeTop * tt = self()->getExit()->getPrevTreeTop();
while (tt->getNode()->getOpCode().isExceptionRangeFence())
tt = tt->getPrevTreeTop();
return tt;
}
TR::TreeTop *
OMR::Block::getLastNonControlFlowTreeTop()
{
TR::TreeTop *tt = self()->getLastRealTreeTop();
while (tt->getNode()->getOpCode().isBranch() ||
tt->getNode()->getOpCode().isReturn() ||
tt->getNode()->getOpCode().isJumpWithMultipleTargets())
{
tt = tt->getPrevTreeTop();
}
return tt;
}
int32_t
OMR::Block::getNumberOfRealTreeTops()
{
TR_ASSERT(self()->getEntry(), "Block must have valid entry treetop\n");
int32_t numRealTreeTops = 0;
TR::TreeTop * tt = self()->getEntry()->getNextRealTreeTop();
TR::TreeTop *exitTree = self()->getExit();
while (tt != exitTree)
{
tt = tt->getNextRealTreeTop();
numRealTreeTops++;
}
return numRealTreeTops;
}
TR::Block *
OMR::Block::createEmptyBlock(TR::Node * n, TR::Compilation *comp, int32_t frequency, TR::Block *block)
{
if (!comp->isPeekingMethod() && (comp->getFlowGraph()->getMaxFrequency() >= 0))
{
TR_ASSERT((frequency >= 0), "Block frequency must be non negative\n");
}
if (block!=NULL) comp->setCurrentBlock(block);
TR::Block * b =
new (comp->trHeapMemory()) TR::Block(
TR::TreeTop::create(comp, TR::Node::create(n, TR::BBStart)),
TR::TreeTop::create(comp, TR::Node::create(n, TR::BBEnd)),
comp->trMemory());
b->getEntry()->join(b->getExit());
b->setFrequency(frequency);
return b;
}
int32_t
OMR::Block::getMaxColdFrequency(TR::Block *b1, TR::Block *b2)
{
int32_t max = -1;
int32_t frequency = b1->getFrequency();
if (b1->isCold())
max = frequency;
frequency = b2->getFrequency();
if (b2->isCold())
{
if (frequency > max)
max = frequency;
}
//TR_ASSERT((max > -1), "At least one of the blocks should be cold\n");
return max;
}
int32_t
OMR::Block::getMinColdFrequency(TR::Block *b1, TR::Block *b2)
{
int32_t min = INT_MAX;
int32_t frequency = b1->getFrequency();
if (b1->isCold())
min = frequency;
frequency = b2->getFrequency();
if (b2->isCold())
{
if (frequency < min)
min = frequency;
}
TR_ASSERT((min < INT_MAX), "At least one of the blocks should be cold\n");
return min;
}
int32_t
OMR::Block::getScaledSpecializedFrequency(int32_t fastFrequency)
{
return (int32_t) ((float) (1.0f - MIN_PROFILED_FREQUENCY)*fastFrequency);
}
bool
OMR::Block::isGotoBlock(TR::Compilation * comp, bool allowPrecedingSnapshots)
{
bool isGoToBlock = ( self()->getEntry() != NULL
&& self()->getLastRealTreeTop()->getPrevTreeTop() == self()->getEntry()
&& self()->getLastRealTreeTop()->getNode()->getOpCodeValue() == TR::Goto);
if (!isGoToBlock && allowPrecedingSnapshots && comp->getOption(TR_EnableSnapshotBlockOpts) && comp->getMethodSymbol()->hasSnapshots())
{
if (self()->getEntry() != NULL && self()->getLastRealTreeTop()->getNode()->getOpCodeValue() == TR::Goto)
{
for (TR::TreeTop *tt = self()->getLastRealTreeTop()->getPrevTreeTop(); tt != self()->getEntry(); tt = tt->getPrevTreeTop())
{
return false;
}
isGoToBlock = true;
}
}
return isGoToBlock;
}
bool
OMR::Block::canFallThroughToNextBlock()
{
TR::Node *lastNode = self()->getLastRealTreeTop()->getNode();
if (lastNode->getOpCodeValue() == TR::treetop)
lastNode = lastNode->getFirstChild();
if (lastNode->getOpCode().isGoto() ||
lastNode->getOpCode().isReturn() ||
lastNode->getOpCodeValue() == TR::athrow ||
lastNode->getOpCodeValue() == TR::igoto)
return false;
return true;
}
/**
* Here we will detect the case where we have a label at BBStart but that will never be used.
* If the only predecessor to the block belonging to the BBStart is the previous block that means that
* we will fallthrough to this block without a branch, and therefore we don't need a label. There are
* some exceptions:
* - If the previous block is a lookup, table or tstart block, then we might have a branch
* instruction to this block even if this block is the fallthrough block
* - if "canFallThroughToNextBlock()" returns false, we abort (it checks for similar situations)
*/
bool
OMR::Block::doesNotNeedLabelAtStart()
{
if (!self()->getEntry()->getNode()->getLabel())
return true;
if (self()->getEntry()->getNode()->getLabel()->isHasAddrTaken())
return false;
for (auto thisEdge = self()->getPredecessors().begin(); thisEdge != self()->getPredecessors().end(); ++thisEdge)
{
TR::Block * from = (*thisEdge)->getFrom()->asBlock();
TR::Block * prevBlock = self()->getPrevBlock();
if (from == prevBlock && from->canFallThroughToNextBlock())
{
TR::Node *lastNode = from->getLastRealTreeTop()->getNode();
if (lastNode->getOpCodeValue() == TR::treetop)
lastNode = lastNode->getFirstChild();
if (lastNode->getOpCodeValue() != TR::lookup &&
lastNode->getOpCodeValue() != TR::table &&
lastNode->getOpCodeValue() != TR::tstart)
continue;
}
return false;
}
return true;
}
/**
* Return fall through edge within a Ebb if any.
* Can handle dummy block created during inlining (callee has dummy nodes).
*/
TR::CFGEdge *
OMR::Block::getFallThroughEdgeInEBB()
{
TR::Block *fallThruCandidate = self()->getExit() ? self()->getNextBlock() : 0;
if (fallThruCandidate && fallThruCandidate->isExtensionOfPreviousBlock())
return self()->getEdge(fallThruCandidate);
return 0;
}
TR::Block *
OMR::Block::breakFallThrough(TR::Compilation *comp, TR::Block *faller, TR::Block *fallee)
{
TR::Node *lastNode = faller->getLastRealTreeTop()->getNode();
if (lastNode->getOpCode().isCheck() || lastNode->getOpCodeValue() == TR::treetop)
lastNode = lastNode->getFirstChild();
if (lastNode->getOpCode().isReturn() ||
lastNode->getOpCode().isGoto() ||
lastNode->getOpCode().isSwitch() ||
lastNode->getOpCode().isJumpWithMultipleTargets() ||
lastNode->getOpCodeValue() == TR::athrow)
return faller; // nothing to do
if (lastNode->getOpCode().isBranch())
{
TR::Node *gotoNode = TR::Node::create(lastNode, TR::Goto);
TR::TreeTop *gotoTree = TR::TreeTop::create(comp, gotoNode);
gotoNode->setBranchDestination(fallee->getEntry());
TR::Block *gotoBlock = TR::Block::createEmptyBlock(lastNode, comp, (fallee->getFrequency() < faller->getFrequency()) ? fallee->getFrequency() : faller->getFrequency(), fallee);
gotoBlock->append(gotoTree);
faller->getExit()->join(gotoBlock->getEntry());
gotoBlock->getExit()->join(fallee->getEntry());
if (faller->getStructureOf())
comp->getFlowGraph()->addNode(gotoBlock, faller->getCommonParentStructureIfExists(fallee, comp->getFlowGraph()));
else
comp->getFlowGraph()->addNode(gotoBlock);
comp->getFlowGraph()->addEdge(TR::CFGEdge::createEdge(faller, gotoBlock, comp->trMemory()));
comp->getFlowGraph()->addEdge(TR::CFGEdge::createEdge(gotoBlock, fallee, comp->trMemory()));
// remove the edge only if the branch target is not pointing to the next block
if (lastNode->getBranchDestination() != fallee->getEntry())
comp->getFlowGraph()->removeEdge(faller, fallee);
if (fallee->isCold() || faller->isCold())
{
//gotoBlock->setIsCold();
if (fallee->isCold())
gotoBlock->setFrequency(fallee->getFrequency());
else
gotoBlock->setFrequency(faller->getFrequency());
}
return gotoBlock;
}
TR::Node *gotoNode = TR::Node::create(lastNode, TR::Goto);
TR::TreeTop *gotoTree = TR::TreeTop::create(comp, gotoNode);
gotoNode->setBranchDestination(fallee->getEntry());
faller->append(gotoTree);
return faller;
}
/**
* @note insertBlockAsFallThrough creates a new edge from block -> newFallThroughBlock. It does _NOT_
* remove any fall-through edge that might have previously existed from block. That responsibility
* is left to the caller since removing the edge at the wrong time could leave the original fallthrough
* successor with no predecessors which could leave it in an unexpectedly deleted state.
*/
void
OMR::Block::insertBlockAsFallThrough(TR::Compilation *comp, TR::Block *block, TR::Block *newFallThroughBlock)
{
TR::TreeTop *origFallThroughEntry = block->getExit()->getNextRealTreeTop();
TR::TreeTop *newFallThroughEntry = newFallThroughBlock->getEntry();
TR::TreeTop *beforeNewFallThrough = newFallThroughEntry->getPrevTreeTop();
TR::TreeTop *afterNewFallThrough = newFallThroughBlock->getExit()->getNextTreeTop();
TR::TreeTop *beforeOrigFallThrough = block->getExit();
// rip newFallThrough block out of trees
beforeNewFallThrough->join(afterNewFallThrough);
// now insert newFallThrough between end of block and its original fall-through successor
TR::TreeTop::insertTreeTops(comp, block->getExit(), newFallThroughBlock->getEntry(), newFallThroughBlock->getExit());
if (!block->hasSuccessor(newFallThroughBlock))
comp->getFlowGraph()->addEdge(block, newFallThroughBlock);
}
/**
* comment about when edge from from -> origTo will be removed (clients should be careful that origTo doesn't unexpectedly go poof!)
* @note redirectFlowToNewDestination will both create a new edge from "from" to "newTo" as well as remove the original edge from
* "from" to origTo. BE CAREFUL when calling this function that there is another predecessor edge for "origTo" or else when
* redirectFlowToNewDestination removes the predecessor "from", "origTo" might be deleted.
*/
void
OMR::Block::redirectFlowToNewDestination(TR::Compilation *comp, TR::CFGEdge *origEdge, TR::Block *newTo, bool useGotoForFallThrough)
{
TR::Block *from = origEdge->getFrom()->asBlock();
TR::Block *origTo = origEdge->getTo()->asBlock();
int32_t fromBlockNumber = from->getNumber();
int32_t origToBlockNumber = origTo->getNumber();
int32_t newToBlockNumber = newTo->getNumber();
if (from->getEntry() == NULL)
{
// from is entry, so only have to change the flow edges (no branch to change)
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
else
{
TR::TreeTop *lastTreeTop = from->getLastRealTreeTop();
TR_ASSERT(lastTreeTop != NULL, "how can there be an entry but no last tree top?");
TR::Node *lastNode = lastTreeTop->getNode();
if (lastNode->getOpCode().isBranch() && lastNode->getBranchDestination() == origTo->getEntry())
{
// need to change the branch destination from origTo to newTo
from->changeBranchDestination(newTo->getEntry(), comp->getFlowGraph());
}
else if (lastNode->getOpCode().isSwitch())
{
TR::TreeTop *origToEntry = origTo->getEntry();
TR::TreeTop *newToEntry = newTo->getEntry();
// find correct switch target(s) and change it to newTo->getNumber()
for (int i=lastNode->getCaseIndexUpperBound()-1; i > 0; i--)
{
TR::Node *child=lastNode->getChild(i);
if (child->getBranchDestination() == origToEntry)
child->setBranchDestination(newToEntry);
}
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
else if (lastNode->getOpCode().isJumpWithMultipleTargets())
{
if (lastNode->getOpCode().hasBranchChildren())
{
traceMsg(comp, "Jump with multple targets, with non fall through path to empty block\n");
TR::TreeTop *origToEntry = origTo->getEntry();
TR::TreeTop *newToEntry = newTo->getEntry();
if(origToEntry)
traceMsg(comp, "jumpwithmultipletargets: origToEntry->getNode = %p\n",origToEntry->getNode());
if(newToEntry)
traceMsg(comp, "jumpwithmultipletargets: newToEntry->getNode = %p\n",newToEntry->getNode());
// Get the right branch target
for (int32_t i=0 ; i < lastNode->getNumChildren()-1 ; i++)
{
TR::Node *child = lastNode->getChild(i);
traceMsg(comp, "considering node %p with branch destination %p \n",child,child->getBranchDestination() ? child->getBranchDestination()->getNode() : 0 );
if (child->getBranchDestination() == origToEntry)
{
child->setBranchDestination(newToEntry);
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
}
else
{
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
else
// from falls through to origTo
{
TR::TreeTop *origToEntry = origTo->getEntry();
TR::TreeTop *newToEntry = newTo->getEntry();
TR::TreeTop *afterNewTo = newTo->getExit()->getNextTreeTop();
TR_ASSERT(from->getExit()->getNextTreeTop() == origToEntry, "Expecting from's fallthrough to be origTo");
if (useGotoForFallThrough)
{
TR::TreeTop *gotoTreeTop = TR::TreeTop::create(comp, TR::Node::create(lastNode, TR::Goto, 0, newTo->getEntry()));
if (lastNode->getOpCode().isBranch())
{
int32_t freq = origEdge->getFrequency();
TR::Block *newGotoBlock = TR::Block::createEmptyBlock(lastNode, comp, freq, from);
newGotoBlock->append(gotoTreeTop);
comp->getFlowGraph()->addNode(newGotoBlock);
comp->getFlowGraph()->addEdge(from, newGotoBlock)->setFrequency(freq);
newGotoBlock->setIsExtensionOfPreviousBlock();
TR::Block::insertBlockAsFallThrough(comp, from, newGotoBlock); // edge won't be duplicated
comp->getFlowGraph()->addEdge(newGotoBlock, newTo)->setFrequency(freq);
comp->getFlowGraph()->removeEdge(from, origTo);
}
else
{
from->append(gotoTreeTop);
if (!from->hasSuccessor(newTo))
comp->getFlowGraph()->addEdge(from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
else
{
TR::Block::insertBlockAsFallThrough(comp, from, newTo);
comp->getFlowGraph()->removeEdge(from, origTo);
}
}
}
}
/**
* This block is being removed from the CFG.
* Remove its trees from the list of trees.
*/
void
OMR::Block::removeFromCFG(TR::Compilation *c)
{
// Remove the trees for this block
//
if (_pEntry != NULL)
{
// Remove trees
for (TR::TreeTop *treeTop = _pEntry, *next; ; treeTop = next)
{
next = treeTop->getNextTreeTop();
TR::TransformUtil::removeTree(c, treeTop);
if (treeTop == _pExit)
break;
}
}
}
TR_RegionStructure *
OMR::Block::getParentStructureIfExists(TR::CFG *cfg)
{
TR_RegionStructure *parent = NULL;
if (self()->getStructureOf() &&
cfg->getStructure())
parent = self()->getStructureOf()->getParent()->asRegion();
return parent;
}
TR_RegionStructure *
OMR::Block::getCommonParentStructureIfExists(TR::Block *b, TR::CFG *cfg)
{
TR_RegionStructure *parent = NULL;
if (self()->getStructureOf() &&
b &&
b->getStructureOf() &&
cfg->getStructure())
parent = self()->getStructureOf()->findCommonParent(b->getStructureOf(), cfg);
return parent;
}
void
OMR::Block::removeBranch(TR::Compilation *c)
{
TR::TreeTop * tt = self()->getLastRealTreeTop();
TR_ASSERT(tt->getNode()->getOpCode().isBranch(), "OMR::Block::removeBranch, block doesn't have a branch");
c->getFlowGraph()->removeEdge(self(), tt->getNode()->getBranchDestination()->getNode()->getBlock());
TR::TransformUtil::removeTree(c, tt);
}
TR::Block *
OMR::Block::findVirtualGuardBlock(TR::CFG *cfg)
{
//TR_ASSERT(getExceptionPredecessors().empty(), "snippet block has an exception predecessor");
for (auto nextEdge = self()->getPredecessors().begin(); nextEdge != self()->getPredecessors().end(); ++nextEdge)
{
TR::Block *prevBlock = toBlock((*nextEdge)->getFrom());
// check for the entry block being the predecessor
// ie. the guard has probably been removed
if (prevBlock == cfg->getStart())
break;
//else if (prevBlock->getLastRealTreeTop()->getNode()->isTheVirtualGuardForAGuardedInlinedCall())
// return prevBlock;
else
{
TR::Node *node = prevBlock->getLastRealTreeTop()->getNode();
if (node->isTheVirtualGuardForAGuardedInlinedCall())
{
// extra check for profiled guards based on VFT
if (node->isProfiledGuard())
{
TR_ASSERT(((node->getOpCodeValue() == TR::ifacmpne) || (node->getOpCodeValue() == TR::ifacmpeq)), "Profile guards must use TR::ifacmpne || TR::ifacmpeq");
if (node->getOpCodeValue() == TR::ifacmpne)
{
if (node->getBranchDestination()->getEnclosingBlock() == self())
return prevBlock;
}
else if (node->getOpCodeValue() == TR::ifacmpeq)
{
if (prevBlock->getNextBlock() == self())
return prevBlock;
}
}
else
{
return prevBlock;
}
}
}
}
return 0;
}
void
OMR::Block::changeBranchDestination(TR::TreeTop * newDestination, TR::CFG *cfg, bool callerFixesRegdeps)
{
TR::Node * branchNode = self()->getLastRealTreeTop()->getNode();
TR_ASSERT(branchNode->getOpCode().isBranch(), "OMR::Block::changeBranchDestination: can't find the existing branch node");
TR::TreeTop * prevDestinationTree = branchNode->getBranchDestination();
if (newDestination == prevDestinationTree)
return; // Nothing to do. Stop here so we don't remove the edge.
TR::Block * prevDestinationBlock = prevDestinationTree->getNode()->getBlock();
branchNode->setBranchDestination(newDestination);
TR::Block * newDestinationBlock = newDestination->getNode()->getBlock();
TR::CFGEdge *prevEdge = self()->getEdge(prevDestinationBlock);
if (!self()->hasSuccessor(newDestinationBlock))
{
TR::CFGEdge *newEdge = cfg->addEdge(self(), newDestinationBlock);
int32_t prevEdgeFrequency = prevEdge->getFrequency();
if (prevDestinationBlock->getFrequency() > 0)
{
int32_t newEdgeFrequency = (prevEdgeFrequency*newDestinationBlock->getFrequency())/prevDestinationBlock->getFrequency();
newEdge->setFrequency(newEdgeFrequency);
}
}
cfg->removeEdge(prevEdge);
if (callerFixesRegdeps)
return;
int32_t numChildren = branchNode->getNumChildren();
if (numChildren >0 &&
branchNode->getChild(numChildren - 1)->getOpCodeValue() == TR::GlRegDeps)
{
TR::Node * fromGlRegDep = branchNode->getChild(numChildren - 1);
TR_ASSERT(fromGlRegDep->getOpCodeValue() == TR::GlRegDeps, "expected the branch child to be a GlRegDep. It's not!");
int32_t numFromGlRegDeps = fromGlRegDep->getNumChildren();
if (newDestination->getNode()->getNumChildren() == 0)
{
branchNode->setNumChildren(numChildren - 1);
for (int32_t i = 0; i < numFromGlRegDeps; ++i)
fromGlRegDep->getChild(i)->recursivelyDecReferenceCount();
}
else
{
TR::Node * toGlRegDep = newDestination->getNode()->getChild(0);
TR_ASSERT(toGlRegDep->getOpCodeValue() == TR::GlRegDeps, "expected the bbstart child to be a GlRegDep. It's not!");
TR_ASSERT(0, "todo: update the GlRegDep info");
}
}
else
{
TR_ASSERT(newDestination->getNode()->getNumChildren() == 0, "todo: update the GlRegDep info");
}
}
void
OMR::Block::uncommonNodesBetweenBlocks(TR::Compilation *comp, TR::Block *newBlock, TR::ResolvedMethodSymbol *methodSymbol)
{
TR_ScratchList<TR::SymbolReference> symbolReferenceTempsA(comp->trMemory());
TR_ScratchList<TR::SymbolReference> injectedBasicBlockTemps(comp->trMemory());
TR_ScratchList<TR::SymbolReference> symbolReferenceTempsC(comp->trMemory());
TR_HandleInjectedBasicBlock ibb(comp, NULL, methodSymbol? methodSymbol: comp->getMethodSymbol(),
symbolReferenceTempsA,
injectedBasicBlockTemps,
symbolReferenceTempsC);
ibb.findAndReplaceReferences(self()->getEntry(), newBlock, NULL);
ListIterator<TR::SymbolReference> injectedBasicBlockTempIter(&injectedBasicBlockTemps);
TR::SymbolReference * injectedBasicBlockTemp = injectedBasicBlockTempIter.getFirst();
for (; injectedBasicBlockTemp; injectedBasicBlockTemp = injectedBasicBlockTempIter.getNext())
{
comp->getMethodSymbol()->addAutomatic(injectedBasicBlockTemp->getSymbol()->castToAutoSymbol());
}
}
bool
OMR::Block::hasExceptionSuccessors()
{
bool hasExceptionSuccessors = (self()->getExceptionSuccessors().empty() == false);
return hasExceptionSuccessors;
}
bool
OMR::Block::isTargetOfJumpWhoseTargetCanBeChanged(TR::Compilation * comp)
{
TR::Block *startBlock = comp->getFlowGraph()->getStart()->asBlock();
for (auto predEdge = self()->getPredecessors().begin(); predEdge != self()->getPredecessors().end(); ++predEdge)
{
TR::Block *predBlock = (*predEdge)->getFrom()->asBlock();
if (predBlock != startBlock && predBlock->getLastRealTreeTop()->getNode()->getOpCode().isJumpWithMultipleTargets() &&
predBlock->getLastRealTreeTop()->getNode()->getOpCode().hasBranchChildren())
return true;
}
return false;
}
TR::Block *
OMR::Block::splitWithGivenMethodSymbol(TR::ResolvedMethodSymbol *methodSymbol, TR::TreeTop * startOfNewBlock, TR::CFG * cfg, bool fixupCommoning, bool copyExceptionSuccessors){
return self()->split(startOfNewBlock, cfg, fixupCommoning, copyExceptionSuccessors, methodSymbol);
}
// Required data structures for analysis in SplitPostGRA
typedef TR::typed_allocator<std::pair<TR::Node* const, std::pair<int32_t, TR::Node *> >, TR::Region&> NodeTableAllocator;
typedef std::less< TR::Node *> NodeTableComparator;
typedef std::map<TR::Node *, std::pair<int32_t, TR::Node *>, NodeTableComparator, NodeTableAllocator> NodeTable;
typedef TR::typed_allocator<std::pair <TR::Node* const, TR::Node *>, TR::Region&> StoreRegNodeTableAllocator;
typedef std::map<TR::Node *, TR::Node *, NodeTableComparator, StoreRegNodeTableAllocator> StoreRegNodeTable;
/*
* Recursive call to replace node with replacement node underneath a target node.
*
* @param A node to be replaced
* @param A table containing information about original nodes to be replaced with corresponding replacement node
* @param checklist Checklist of nodes that have already been searched.
*/
static void replaceNodesInSubtree(TR::Node *node, NodeTable *nodeInfo, TR::NodeChecklist &checklist)
{
if (checklist.contains(node))
return;
checklist.add(node);
for (int i = 0; i < node->getNumChildren(); ++i)
{
TR::Node *child = node->getChild(i);
auto entry = nodeInfo->find(child);
if (entry != nodeInfo->end())
{
node->setAndIncChild(i, entry->second.second);
child->decReferenceCount();
}
else
{
replaceNodesInSubtree(child, nodeInfo, checklist);
}
}
}
/*
* Search for the nodes to be uncommoned from the split point till end of extended basic block
*
* @param Compilation object
* @param start tree top from where it needs to start searching
* @param table containing information about original nodes to be replaced with corresponding replacement node
*/
static void replaceNodesInTrees(TR::Compilation * comp, TR::TreeTop *start, NodeTable *nodeInfo)
{
TR::NodeChecklist checklist(comp);
while (start)
{
if (start->getNode()->getOpCodeValue() == TR::BBStart && !start->getNode()->getBlock()->isExtensionOfPreviousBlock())
break;
replaceNodesInSubtree(start->getNode(), nodeInfo, checklist);
start = start->getNextTreeTop();
}
}
/*
* Analyzes the node and list of unavailable registers to find a register pair which can be used to store the node
*
* @param Compilation object
* @param Node which requires to be uncommoned
* @param BitVector constaining information about the unavailable registers
* @return Pair of GlobalRegisterNumber which can be used to store node
*/
static std::pair<TR_GlobalRegisterNumber,TR_GlobalRegisterNumber> findAvailableRegister(TR::Compilation *comp, TR::Node *node, TR_BitVector &unavailableRegisters)
{
TR_GlobalRegisterNumber firstGPR = comp->cg()->getFirstGlobalGPR();
TR_GlobalRegisterNumber lastGPR = comp->cg()->getLastGlobalGPR();
TR_GlobalRegisterNumber firstFPR = comp->cg()->getFirstGlobalFPR();
TR_GlobalRegisterNumber lastFPR = comp->cg()->getLastGlobalFPR();
TR_GlobalRegisterNumber firstVRF = comp->cg()->getFirstGlobalVRF();
TR_GlobalRegisterNumber lastVRF = comp->cg()->getLastGlobalVRF();
std::pair<TR_GlobalRegisterNumber,TR_GlobalRegisterNumber> toReturn = std::make_pair<TR_GlobalRegisterNumber,TR_GlobalRegisterNumber>(-1,-1);
TR_GlobalRegisterNumber start, end;
TR::DataType dt = node->getType();
if (dt.isIntegral() || dt.isAddress())
{
start = firstGPR;
end = lastGPR;
}
else if (dt.isFloatingPoint())
{
start = firstFPR;
end = lastFPR;
}
else if (dt.isVector())
{
start = firstVRF;
end = lastVRF;
}
else
{
return toReturn;
}
for (TR_GlobalRegisterNumber itr = start; itr < end; ++itr)
{
if (!unavailableRegisters.get(itr))
{
toReturn.first = itr;
unavailableRegisters.set(itr);
break;
}
}
if (node->requiresRegisterPair(comp) && toReturn.first > -1)
{
for (TR_GlobalRegisterNumber itr = start; itr < end; ++itr)
{
if (!unavailableRegisters.get(itr))
{
toReturn.second = itr;
unavailableRegisters.set(itr);
break;
}
}
if (toReturn.second == -1)
{
unavailableRegisters.reset(toReturn.first);
toReturn.first = -1;
}
}
return toReturn;
}
/*
* Returns a boolean notifying if the registers used by given nodes are available or not
*
* @param Compilation object
* @param Node whose used registers are required to be checked for availability
* @param BitVector constaining information about the unavailable registers
* @return A boolean notifying if the registers used by the RegStore can be uses for uncommoning node
*/
static bool checkIfRegisterIsAvailable(TR::Compilation *comp, TR::Node *node, TR_BitVector &unavailableRegisters)
{
// Following assert is to make sure that this function is called with node which have Global Registers associated with it.
TR_ASSERT_FATAL(node->getOpCode().isStoreReg(), "checkIfRegisterIsAvailable is used with %s while it is intended to use with RegStore nodes only", node->getName(comp->getDebug()));
bool registersAreAvailable = !unavailableRegisters.isSet(node->getGlobalRegisterNumber());
if (node->requiresRegisterPair(comp))
registersAreAvailable &= !unavailableRegisters.isSet(node->getHighGlobalRegisterNumber());
return registersAreAvailable;
}
/*
* Iterate through the list of StoreReg Node and associate the given passThroughNode with it.
*
* @param PassThrough node
* @param List of RegStore nodes
* @return A boolean notifying if registers used by passthrough node can be used for uncommoning
*/
static bool checkStoreRegNodeListForNode(TR::Node *passThroughNode, List<TR::Node> *storeNodeList)
{
TR::Node *value = passThroughNode->getFirstChild();
ListIterator<TR::Node> nodeListIter(storeNodeList);
for (TR::Node *storeNode = nodeListIter.getCurrent(); storeNode; storeNode=nodeListIter.getNext())
{
if (storeNode->getFirstChild() == value &&
storeNode->getLowGlobalRegisterNumber() == passThroughNode->getLowGlobalRegisterNumber() &&
storeNode->getHighGlobalRegisterNumber() == passThroughNode->getHighGlobalRegisterNumber())
return true;
}
return false;
}
/*
* Analyze the register dependency and update the list of unavailable registers.
* It examines the node under passthrough children of the glRegDeps and does the following.
* If node requires uncommoning and we do not have replacement yet, looks into the list