-
Notifications
You must be signed in to change notification settings - Fork 391
/
OMRLinkage.cpp
3375 lines (2968 loc) · 134 KB
/
OMRLinkage.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 (c) 2000, 2018 IBM Corp. and others
*
* 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] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#pragma csect(CODE,"TRLINKAGEBase#C")
#pragma csect(STATIC,"TRLINKAGEBase#S")
#pragma csect(TEST,"TRLINKAGEBase#T")
// See also S390Linkage2.cpp which contains more S390 Linkage
// implementations (primarily System Linkage and derived classes).
#include "codegen/OMRLinkage.hpp"
#include <stddef.h> // for NULL, size_t
#include <stdint.h> // for int32_t, uint8_t, etc
#include "codegen/CodeGenerator.hpp" // for CodeGenerator
#include "codegen/ConstantDataSnippet.hpp"
#include "codegen/FrontEnd.hpp" // for TR_FrontEnd, etc
#include "codegen/InstOpCode.hpp" // for InstOpCode, etc
#include "codegen/Instruction.hpp" // for Instruction, etc
#include "codegen/Linkage.hpp" // for LinkageBase, etc
#include "codegen/LinkageConventionsEnum.hpp"
#include "codegen/LiveRegister.hpp" // for TR_LiveRegisters
#include "codegen/Machine.hpp" // for Machine
#include "codegen/MemoryReference.hpp"
#include "codegen/RealRegister.hpp" // for RealRegister, etc
#include "codegen/RecognizedMethods.hpp"
#include "codegen/Register.hpp" // for Register
#include "codegen/RegisterConstants.hpp"
#include "codegen/RegisterDependency.hpp"
#include "codegen/RegisterDependencyStruct.hpp"
#include "codegen/RegisterPair.hpp" // for RegisterPair
#include "codegen/SystemLinkage.hpp" // for SystemLinkage
#include "codegen/TreeEvaluator.hpp"
#include "codegen/S390Evaluator.hpp"
#include "compile/Compilation.hpp" // for Compilation
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/CompilerEnv.hpp"
#include "env/ObjectModel.hpp" // for ObjectModel
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/Block.hpp" // for Block
#include "il/DataTypes.hpp" // for TR::DataType, etc
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp" // for ILOpCode
#include "il/Node.hpp" // for Node
#include "il/Node_inlines.hpp" // for Node::getDataType, etc
#include "il/Symbol.hpp" // for Symbol, etc
#include "il/SymbolReference.hpp" // for SymbolReference
#include "il/TreeTop.hpp" // for TreeTop
#include "il/TreeTop_inlines.hpp" // for TreeTop::getNode
#include "il/symbol/AutomaticSymbol.hpp" // for AutomaticSymbol
#include "il/symbol/LabelSymbol.hpp"
#include "il/symbol/MethodSymbol.hpp" // for MethodSymbol
#include "il/symbol/ParameterSymbol.hpp" // for ParameterSymbol
#include "il/symbol/RegisterMappedSymbol.hpp"
#include "il/symbol/ResolvedMethodSymbol.hpp"
#include "il/symbol/StaticSymbol.hpp" // for StaticSymbol
#include "infra/Assert.hpp" // for TR_ASSERT
#include "infra/BitVector.hpp" // for TR_BitVector
#include "infra/List.hpp" // for ListIterator, etc
#include "ras/Debug.hpp" // for TR_DebugBase
#include "runtime/Runtime.hpp"
#include "z/codegen/CallSnippet.hpp"
#include "z/codegen/S390GenerateInstructions.hpp"
#include "z/codegen/S390HelperCallSnippet.hpp"
#include "z/codegen/S390Instruction.hpp" // for etc
#include "z/codegen/TRSystemLinkage.hpp"
#ifdef J9_PROJECT_SPECIFIC
#include "env/VMJ9.h"
#endif
extern TR::Instruction* generateS390ImmToRegister(TR::CodeGenerator * cg, TR::Node * node, TR::Register * targetRegister,
intptr_t value, TR::Instruction * cursor);
extern bool storeHelperImmediateInstruction(TR::Node * valueChild, TR::CodeGenerator * cg, bool isReversed, TR::InstOpCode::Mnemonic op, TR::Node * node, TR::MemoryReference * mf);
static int32_t getLastMaskedBit(int16_t mask); ///< forward reference
static int32_t getFirstMaskedBit(int16_t mask); ///< formward reference
////////////////////////////////////////////////////////////////////////////////
// TR::S390Linkage member functions
////////////////////////////////////////////////////////////////////////////////
/**
* Get or create the TR::Linkage object that corresponds to the given linkage
* convention.
* Even though this method is common, its implementation is machine-specific.
*/
OMR::Z::Linkage::Linkage(TR::CodeGenerator * codeGen,TR_S390LinkageConventions elc, TR_LinkageConventions lc)
: OMR::Linkage(),
_codeGen(codeGen), _explicitLinkageType(elc), _linkageType(lc), _stackSizeCheckNeeded(true), _raContextSaveNeeded(true),
_integerReturnRegister(TR::RealRegister::NoReg),
_floatReturnRegister(TR::RealRegister::NoReg),
_doubleReturnRegister(TR::RealRegister::NoReg),
_longLowReturnRegister(TR::RealRegister::NoReg),
_longHighReturnRegister(TR::RealRegister::NoReg),
_longReturnRegister(TR::RealRegister::NoReg),
_stackPointerRegister(TR::RealRegister::NoReg),
_entryPointRegister(TR::RealRegister::NoReg),
_litPoolRegister(TR::RealRegister::NoReg),
_staticBaseRegister(TR::RealRegister::NoReg),
_privateStaticBaseRegister(TR::RealRegister::NoReg),
_returnAddrRegister(TR::RealRegister::NoReg),
_raContextRestoreNeeded(true),
_firstSaved(TR::RealRegister::NoReg),
_lastSaved(TR::RealRegister::NoReg),
_lastPrologueInstr(NULL),
_firstPrologueInstr(NULL),
_frameType(standardFrame)
{
int32_t i;
self()->setProperties(0);
for (i=0; i<TR::RealRegister::NumRegisters;i++)
{
self()->setRegisterFlags(REGNUM(i),0);
}
}
void
OMR::Z::Linkage::markPreservedRegsInDep(TR::RegisterDependencyConditions * deps)
{
for (int32_t curReg = TR::RealRegister::FirstGPR; curReg <= TR::RealRegister::LastFPR; curReg++)
{
if (self()->getPreserved(REGNUM(curReg)) &&
deps->searchPostConditionRegister(REGNUM(curReg)))
{
self()->getRealRegister(REGNUM(curReg))->setModified(true);
}
}
// and the RAReg
if (deps && deps->searchPostConditionRegister(self()->cg()->getReturnAddressRegister()))
{
self()->getRealRegister(self()->getReturnAddressRegister())->setModified(true);
}
}
void
OMR::Z::Linkage::markPreservedRegsInBlock(int32_t blockNum)
{
// kill RAReg
self()->getRealRegister(self()->getReturnAddressRegister())->setModified(true);
// catch blocks kill all preserved regs
for (int32_t curReg = TR::RealRegister::FirstGPR; curReg <= TR::RealRegister::LastFPR; curReg++)
{
if (self()->getPreserved(REGNUM(curReg)))
{
self()->getRealRegister(REGNUM(curReg))->setModified(true);
}
}
}
TR::Instruction *
OMR::Z::Linkage::loadUpArguments(TR::Instruction * cursor)
{
return NULL;
}
void
OMR::Z::Linkage::removeOSCOnSavedArgument(TR::Instruction* instr, TR::Register* sReg, int32_t stackOffset)
{
bool done=false;
int32_t windowSize=0;
const int32_t maxWindowSize=10;
// Start looking at the top of instruction stream body
//
TR::Instruction * current = instr->getNext();
static char *disable = feGetEnv("TR_EnableRemoveOSC");
if (!disable)
return;
if (self()->comp()->getOption(TR_TraceCG))
traceMsg(self()->comp(), "%p SP OFFSET %d, SREG %p\n",instr, stackOffset, sReg);
while ( (current != NULL) &&
!current->isLabel() &&
!current->isCall() &&
!current->isBranchOp() &&
windowSize < maxWindowSize && !done )
{
if (self()->comp()->getOption(TR_TraceCG))
traceMsg(self()->comp(), "%p inspecting\n", current);
if (current->isLoad())
{
TR::Register *tReg = ((TR::S390RXInstruction*)current)->getRegisterOperand(1);
TR::MemoryReference *mr = current->getMemoryReference();
TR::SymbolReference *symRef = mr->getSymbolReference();
TR::Symbol *sym = symRef->getSymbol();
int32_t disp = -1;
// Make sure the sym is a param
//
if (sym && sym->isRegisterMappedSymbol() && sym->getKind()==TR::Symbol::IsParameter)
{
disp = sym->castToRegisterMappedSymbol()->getOffset() + mr->getOffset();
}
TR::Instruction *newInst = NULL;
if (self()->comp()->getOption(TR_TraceCG))
traceMsg(self()->comp(), "%p is load, mrOffset %i\n",current, disp);
// Find a memRef that matches the store
//
if (disp == stackOffset)
{
TR::Instruction* prev = current->getPrev();
TR::InstOpCode::Mnemonic opCode = current->getOpCodeValue();
bool mustReplace = true;
if (opCode == TR::InstOpCode::L)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LR, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::L %s,%d(SP) to TR::InstOpCode::LR %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
mustReplace = false; // If sReg = treg, just delete the redundent load
}
else if (opCode == TR::InstOpCode::LG)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LGR, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::LG %s,%d(SP) to TR::InstOpCode::LGR %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
mustReplace = false; // If sReg = treg, just delete the redundent load
}
else if (opCode == TR::InstOpCode::LE)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LER, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::LE %s,%d(SP) to TR::InstOpCode::LER %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
mustReplace = false; // If sReg = treg, just delete the redundent load
}
else if (opCode == TR::InstOpCode::LD)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LDR, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::LD %s,%d(SP) to TR::InstOpCode::LDR %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
mustReplace = false; // If sReg = treg, just delete the redundent load
}
else if (opCode == TR::InstOpCode::LT)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LTR, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::LT %s,%d(SP) to TR::InstOpCode::LTR %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
}
else if (opCode == TR::InstOpCode::LTG)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LTGR, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::LTG %s,%d(SP) to TR::InstOpCode::LTGR %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
}
else if (opCode == TR::InstOpCode::LGF)
{
newInst = generateRRInstruction(self()->cg(), TR::InstOpCode::LGFR, current->getNode(), tReg, sReg, prev);
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "\nProlog peeking changing TR::InstOpCode::LGF %s,%d(SP) to TR::InstOpCode::LGFR %s,%s : [%p] => [%p]\n",
tReg->getRegisterName(self()->comp()), stackOffset,
tReg->getRegisterName(self()->comp()), sReg->getRegisterName(self()->comp()), current, newInst);
}
}
// Replace if we have a new instruction
//
if (newInst &&
performTransformation(self()->comp(), "O^O : Prolog peeking removing [%p]\n", current) )
{
self()->cg()->replaceInst(current, newInst);
self()->cg()->deleteInst(current);
if(!mustReplace && tReg == sReg)
{
self()->cg()->deleteInst(newInst);
if (self()->comp()->getOption(TR_TraceCG))
traceMsg(self()->comp(), "deleting instruction as sreg = treg\n");
}
done = true;
}
}
else if (current->matchesTargetRegister(sReg))
{
done = true;
}
}
else if (current->matchesTargetRegister(sReg))
{
done = true;
}
current=current->getNext();
windowSize++;
}
return;
}
/**
* This routine is called to save the arguments on stack when we generate
* the prolog code.
*/
void *
OMR::Z::Linkage::saveArguments(void * cursor, bool genBinary, bool InPreProlog, int32_t frameOffset, List<TR::ParameterSymbol> *parameterList
)
{
TR::RealRegister * stackPtr = self()->getNormalStackPointerRealRegister();
static const bool enableVectorLinkage = self()->cg()->getSupportsVectorRegisters();
// for XPLink or FASTLINK, there are cases where the "normal" stack pointer is
// not appropriate for where to save arguments in registers.
bool useAlternateStackPointer = false;
if (self()->isXPLinkLinkageType())
{
useAlternateStackPointer = true;
}
if (useAlternateStackPointer)
{
stackPtr = self()->getStackPointerRealRegister();
}
TR::ResolvedMethodSymbol * bodySymbol = self()->comp()->getJittedMethodSymbol();
ListIterator<TR::ParameterSymbol> paramIterator((parameterList!=NULL) ? parameterList : &(bodySymbol->getParameterList()));
TR::ParameterSymbol * paramCursor;
TR::Node * firstNode = self()->comp()->getStartTree()->getNode();
TR_BitVector globalAllocatedRegisters;
TR_BitVector freeScratchable;
int32_t busyMoves[5][32];
int32_t busyIndex = 0, lastFreeIntArgIndex = 0, lastFreeFloatArgIndex = 0, lastFreeVectorArgIndex = 0, i1;
uint32_t binLocalRegs = 0x1<<14; // Binary pattern representing reg14 as free for local alloc
int8_t gprSize = self()->cg()->machine()->getGPRSize();
bool unconditionalSave = false;
// If we use preexistence or FSD or HCR, then we could be reverting back to the
// interpreter by creating prePrologue snippets. In such cases, we need
// to pass any register arguments back onto the stack, even if they are
// read-only.
// For FSD, we need to store all parameters back onto the stack.
unconditionalSave |= (InPreProlog && self()->comp()->cg()->mustGenerateSwitchToInterpreterPrePrologue());
unconditionalSave |= (self()->isForceSaveIncomingParameters() != 0);
int32_t lastReg = TR::RealRegister::LastFPR;
// Keep a list of available scratch register
// -> reset means assigned
// -> set means free
// Keep a list of global registers
//
if (self()->cg()->supportsHighWordFacility())
{
freeScratchable.init(TR::RealRegister::LastHPR + 1, self()->trMemory());
globalAllocatedRegisters.init(TR::RealRegister::LastHPR + 1, self()->trMemory());
lastReg = TR::RealRegister::LastHPR;
}
else
{
if (enableVectorLinkage)
{
freeScratchable.init(TR::RealRegister::LastVRF + 1, self()->trMemory());
globalAllocatedRegisters.init(TR::RealRegister::LastVRF + 1, self()->trMemory());
}
else
{
freeScratchable.init(TR::RealRegister::LastFPR + 1, self()->trMemory());
globalAllocatedRegisters.init(TR::RealRegister::LastFPR + 1, self()->trMemory());
}
}
for (i1 = TR::RealRegister::FirstGPR; i1 <= lastReg; i1++)
{
// TODO: remove hard-coded GPR6, valid on zOS for non-XPLINK?
bool gpr6Test = (i1 >= TR::RealRegister::GPR6);
if ((gpr6Test || !self()->getPreserved(REGNUM(i1))) &&
!self()->getIntegerArgument(REGNUM(i1)) &&
!self()->getFloatArgument(REGNUM(i1)))
{
freeScratchable.set(i1);
}
}
for (paramCursor = paramIterator.getFirst(); paramCursor != NULL; paramCursor = paramIterator.getNext())
{
int32_t ai = paramCursor->getAllocatedIndex();
int32_t ai_l = paramCursor->getAllocatedLow(); // low reg of a pair
// Contruct list of globally allocated registers
//
if (ai > 0)
{
globalAllocatedRegisters.set(ai);
}
if (ai_l > 0)
{
globalAllocatedRegisters.set(ai_l);
}
}
if (self()->isSkipGPRsForFloatParms())
{ // set GPRs skipped for FPRs to free
int32_t numIntArgs = -1, r;
for (paramCursor = paramIterator.getFirst(); paramCursor != NULL; paramCursor = paramIterator.getNext())
{
TR::DataType type = paramCursor->getType();
if (type.isFloatingPoint())
{
int32_t count = 0;
if (type.getDataType() == TR::Double
#ifdef J9_PROJECT_SPECIFIC
|| type.getDataType() == TR::DecimalDouble
#endif
)
count = (TR::Compiler->target.is64Bit()) ? 1 : 2;
#ifdef J9_PROJECT_SPECIFIC
else if (type.isLongDouble())
count = (TR::Compiler->target.is64Bit()) ? 2 : 4;
#endif
else
count = 1;
for (int32_t i = 0; i < count; i++)
{
numIntArgs++;
if (numIntArgs < self()->getNumIntegerArgumentRegisters())
{
r = self()->getIntegerArgumentRegister(numIntArgs);
freeScratchable.set(r); // GPR is free (due to hole)
}
}
}
else
{
numIntArgs += (type.isInt64() && TR::Compiler->target.is32Bit()) ? 2 : 1;
}
}
}
int32_t parmNum = 0;
for (paramCursor = paramIterator.getFirst(); paramCursor != NULL; paramCursor = paramIterator.getNext())
{
parmNum++;
int32_t lri = paramCursor->getLinkageRegisterIndex(); // linkage register
int32_t ai = paramCursor->getAllocatedIndex(); // global reg number
TR::DataType dtype = paramCursor->getDataType();
int32_t offset = paramCursor->getParameterOffset() - frameOffset;
TR::SymbolReference * paramSymRef = NULL;
int32_t namelen = 0;
const char * param_name = NULL;
param_name = paramCursor->getTypeSignature(namelen);
// Treat GPR6 special on zLinux. It is a linkage register but also preserved.
// If it has no global reg number, locate it on local save area instead of register save area
if (TR::Compiler->target.isLinux() &&
(lri > 0 && ai < 0 && (self()->getPreserved(REGNUM(lri + 3)) || dtype.isVector())))
paramCursor->setParmHasToBeOnStack();
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "save argument: %s, lri: %d, ai: %d, offset: %d, isReferenced: %d, hasToBeOnStack: %d\n", param_name, lri, ai, offset, paramCursor->isReferencedParameter(),self()->hasToBeOnStack(paramCursor));
}
TR::InstOpCode::Mnemonic storeOpCode, loadOpCode;
uint32_t opcodeMask = 0;
bool secondStore = false;
int32_t slotSize = paramCursor->getSize();
if (slotSize < 4)
slotSize = 4;
switch (slotSize)
{
case 1:
storeOpCode = TR::InstOpCode::STC;
loadOpCode = TR::InstOpCode::IC;
break;
case 2:
storeOpCode = TR::InstOpCode::STH;
loadOpCode = TR::InstOpCode::ICM; // mask 3
opcodeMask = 0x3;
break;
case 3:
storeOpCode = TR::InstOpCode::STCM; // mask 7
loadOpCode = TR::InstOpCode::ICM; // mask 7
opcodeMask = 0x7;
break;
case 4:
storeOpCode = TR::InstOpCode::ST;
loadOpCode = TR::InstOpCode::L;
break;
case 8:
if (TR::Compiler->target.is64Bit())
{
storeOpCode = TR::InstOpCode::STG;
loadOpCode = TR::InstOpCode::LG;
}
else
{
storeOpCode = TR::InstOpCode::ST;
secondStore = true;
loadOpCode = TR::InstOpCode::L;
}
break;
case 16:
storeOpCode = TR::InstOpCode::VST;
loadOpCode = TR::InstOpCode::VL;
break;
}
if (ai >= 0 &&
loadOpCode == TR::InstOpCode::L && self()->cg()->supportsHighWordFacility() && self()->getRealRegister(REGNUM(ai))->isHighWordRegister())
loadOpCode = TR::InstOpCode::LFH;
if (((self()->isSmallIntParmsAlignedRight() && paramCursor->getType().isIntegral()) ||
(self()->isPadFloatParms() && paramCursor->getType().isFloatingPoint())) && (gprSize > paramCursor->getSize()))
{
offset = offset & ~(gprSize-1);
}
// Reset "stack" pointer - which could change below
// with special register usage
stackPtr = self()->getNormalStackPointerRealRegister();
if (useAlternateStackPointer) stackPtr = self()->getStackPointerRealRegister();
// +ve lri means a linkage register is being used
//
if (lri >= 0)
{
TR::DataType type = paramCursor->getType();
TR::RealRegister::RegNum regNum;
// Long argument is completely in regs
//
bool fullLong = (type.isInt64() && lri < self()->getNumIntegerArgumentRegisters() - 1);
if (type.isFloatingPoint()) // float/double/long double
{
regNum = self()->getFloatArgumentRegister(lri);
lastFreeFloatArgIndex = lri + 1;
#ifdef J9_PROJECT_SPECIFIC
if (dtype == TR::DecimalLongDouble)
{
TR_ASSERT( ((lri%2) == 0) , "LongDouble must be passed in legal FP reg pair!");
TR_ASSERT( (lri < (self()->getNumFloatArgumentRegisters() - 1)),"long double must be passed in FP reg pair in full");
lastFreeFloatArgIndex++;
}
#endif
}
else if(TR::Compiler->target.isLinux() && dtype == TR::Aggregate)
{
TR_ASSERT( paramCursor->getSize()<=8, "Only aggregates of size 8 bytes or less are passed in registers");
regNum = self()->getIntegerArgumentRegister(lri);
lastFreeIntArgIndex = lri + 1;
if(TR::Compiler->target.is32Bit() && paramCursor->getSize() > 4)
{
fullLong = true; // On 31 bit this larger aggregate will be treated like a 64 bit long
lastFreeIntArgIndex++;
}
}
else if (enableVectorLinkage && dtype.isVector()) // vector type
{
regNum = self()->getVectorArgumentRegister(lri);
lastFreeVectorArgIndex = lri + 1;
}
else
{
regNum = self()->getIntegerArgumentRegister(lri);
lastFreeIntArgIndex = lri + 1;
if (fullLong && TR::Compiler->target.is32Bit())
{
lastFreeIntArgIndex++;
}
}
if (self()->comp()->getOption(TR_TraceCG))
{
traceMsg(self()->comp(), "save argument: %s, regNum: %d, \n", param_name, regNum);
}
// XPLINK(STOREARGS)
if ( !paramCursor->isReferencedParameter() && !paramCursor->isParmHasToBeOnStack() &&
(!unconditionalSave || (unconditionalSave && dtype != TR::Address)) )
{
freeScratchable.set(regNum);
if (fullLong && TR::Compiler->target.is32Bit())
{
freeScratchable.set(regNum + 1);
}
#ifdef J9_PROJECT_SPECIFIC
if (type.isLongDouble())
freeScratchable.set(regNum + 2); // 2nd of even-even FP pair
#endif
continue;
}
bool skipLong = false;
// Negative ai means the register is not a global, so store the argument
// off to the stack
//
// If a parameter is not referenced in the method (i.e. not used),
// then we do not have to store it back onto the stack if either:
// 1) We are not reverting back to interpreter.
// (For more details, see unconditionalSave comment above.)
// 2) We are reverting back to interpreter, and the parameter's
// type is not an address.
// 3) FSD, all parms have to be on stack, so that if method
// has breakpoint set, all values, including unreferenced parms
// will be updated by GC.
//
// For static zLinux, if you are a leaf routine, you cannot store anything on to the stack.
// This query here is actually not ideal. originally isReferencedParameter (which actually means isReferencedParameterAtIlGenTime) was replaced with isParmHasToBeOnStack, which would make sense.
// However, this broke some java modes (OSR,HCR). Likely, those modes should rely on 'unconditionalSave' to ensure we always store out to the stack for whenever we need all variables on the stack.
// This investigation will be a future todo .
if (!self()->getIsLeafRoutine() && ((ai < 0 && paramCursor->isReferencedParameter()) ||
self()->hasToBeOnStack(paramCursor) || unconditionalSave))
{
bool regIsUsed = false;
switch (dtype)
{
case TR::Int8:
case TR::Int16:
case TR::Int32:
case TR::Address:
case TR::Int64:
case TR::Aggregate: // Should only happen on zLinux
{
if (genBinary)
{
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(storeOpCode, (uint8_t *) cursor,
self()->getRealRegister(regNum), offset, self()->cg());
}
else
{
TR::MemoryReference* mr = generateS390MemoryReference(stackPtr, offset, self()->cg(), param_name);
if (storeOpCode == TR::InstOpCode::STCM)
cursor = generateRSInstruction(self()->cg(), TR::InstOpCode::STCM, firstNode, self()->getRealRegister(regNum),
opcodeMask, mr, (TR::Instruction *) cursor);
else
cursor = generateRXInstruction(self()->cg(), storeOpCode, firstNode, self()->getRealRegister(regNum),
mr, (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
if (!InPreProlog && !globalAllocatedRegisters.isSet(regNum))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(regNum), offset);
}
}
if (secondStore &&
fullLong &&
TR::Compiler->target.is32Bit())
{
if (genBinary)
{
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(TR::InstOpCode::ST, (uint8_t *) cursor, self()->getRealRegister(regNum),
offset, self()->cg());
}
else
{
TR::MemoryReference* mr = generateS390MemoryReference(stackPtr, offset + 4, self()->cg(), param_name);
cursor = generateRXInstruction(self()->cg(), TR::InstOpCode::ST, firstNode, self()->getRealRegister(REGNUM(regNum + 1)),
mr, (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
if (!InPreProlog && !globalAllocatedRegisters.isSet(regNum))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(regNum), offset);
}
// argument stored, so regnum is free to be used as a scratch reg
//
if (ai < 0)
{
freeScratchable.set(regNum + 1);
}
}
break;
case TR::Float:
#ifdef J9_PROJECT_SPECIFIC
case TR::DecimalFloat:
#endif
if (genBinary)
{
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(TR::InstOpCode::STE, (uint8_t *) cursor, self()->getRealRegister(regNum),
offset, self()->cg());
}
else
{
TR::MemoryReference* mr = generateS390MemoryReference(stackPtr, offset, self()->cg(), param_name);
cursor = generateRXInstruction(self()->cg(), TR::InstOpCode::STE, firstNode, self()->getRealRegister(regNum),
mr, (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
if (!InPreProlog && !globalAllocatedRegisters.isSet(regNum))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(regNum), offset);
}
break;
case TR::Double:
#ifdef J9_PROJECT_SPECIFIC
case TR::DecimalDouble:
#endif
if (genBinary)
{
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(TR::InstOpCode::STD, (uint8_t *) cursor, self()->getRealRegister(regNum),
offset, self()->cg());
}
else
{
TR::MemoryReference* mr = generateS390MemoryReference(stackPtr, offset, self()->cg(), param_name);
cursor = (void *) generateRXInstruction(self()->cg(), TR::InstOpCode::STD, firstNode, self()->getRealRegister(regNum),
mr, (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
if (!InPreProlog && !globalAllocatedRegisters.isSet(regNum))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(regNum), offset);
}
break;
#ifdef J9_PROJECT_SPECIFIC
case TR::DecimalLongDouble:
if (genBinary)
{
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(TR::InstOpCode::STD, (uint8_t *) cursor, self()->getRealRegister(regNum),
offset, self()->cg());
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(TR::InstOpCode::STD, (uint8_t *) cursor, self()->getRealRegister(REGNUM(regNum+2)),
offset+8, self()->cg());
}
else
{
TR::MemoryReference* mr = generateS390MemoryReference(stackPtr, offset, self()->cg(), param_name);
TR::MemoryReference * hiMR = generateS390MemoryReference(*mr, 8, self()->cg());
cursor = (void *) generateRXInstruction(self()->cg(), TR::InstOpCode::STD, firstNode, self()->getRealRegister(regNum),
mr, (TR::Instruction *) cursor);
cursor = (void *) generateRXInstruction(self()->cg(), TR::InstOpCode::STD, firstNode, self()->getRealRegister(REGNUM(regNum+2)),
hiMR, (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
if (!InPreProlog && !globalAllocatedRegisters.isSet(regNum))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(regNum), offset);
if (!InPreProlog && !globalAllocatedRegisters.isSet(REGNUM(regNum+2)))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(REGNUM(regNum+2)), offset+8);
}
break;
#endif
case TR::VectorInt8:
case TR::VectorInt16:
case TR::VectorInt32:
case TR::VectorInt64:
case TR::VectorDouble:
if (genBinary)
{
cursor = (void *) TR::S390CallSnippet::storeArgumentItem(TR::InstOpCode::VST, (uint8_t *) cursor, self()->getRealRegister(regNum),
offset, self()->cg());
}
else
{
TR::MemoryReference* mr = generateS390MemoryReference(stackPtr, offset, self()->cg(), param_name);
cursor = generateRXInstruction(self()->cg(), TR::InstOpCode::VST, firstNode, self()->getRealRegister(regNum),
mr, (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
if (!InPreProlog && !globalAllocatedRegisters.isSet(regNum))
self()->removeOSCOnSavedArgument((TR::Instruction *)cursor, self()->getRealRegister(regNum), offset);
}
break;
} //switch(dtype)
// argument stored, so regnum is free to be used as a scratch reg
//
if (ai < 0 )
{
freeScratchable.set(regNum);
#ifdef J9_PROJECT_SPECIFIC
if (dtype == TR::DecimalLongDouble)
freeScratchable.set(regNum+2);
#endif
}
}
// Global register is allocated to this argument, try and move arg to global
//
if (ai>=0 && !InPreProlog)
{
// Argument regNum is not the same as global reg so add in some register moves to fix up
// Or we have long reg on 31bir, so we need to build the 64bit register from the two
// arguments (reg + reg) or (reg + mem)
// also need to take care of longdouble/complex types which takes 2 or more slots
if (regNum != ai || (dtype == TR::Int64 && TR::Compiler->target.is32Bit()))
{
// Global register is available as scratch reg, so make the move
//
if (freeScratchable.isSet(ai))
{
if (dtype == TR::Float
|| dtype == TR::Double
#ifdef J9_PROJECT_SPECIFIC
|| dtype == TR::DecimalFloat
|| dtype == TR::DecimalDouble
#endif
)
{
cursor = generateRRInstruction(self()->cg(), TR::InstOpCode::LDR, firstNode, self()->getRealRegister(REGNUM(ai)),
self()->getRealRegister(regNum), (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
freeScratchable.reset(ai);
freeScratchable.set(regNum);
}
#ifdef J9_PROJECT_SPECIFIC
else if (dtype == TR::DecimalLongDouble)
{
int32_t ai_l = paramCursor->getAllocatedLow(); // low reg of a pair
TR_ASSERT( (ai_l == (ai+2)),"global RA incorrect for long double params");
cursor = generateRRInstruction(self()->cg(), TR::InstOpCode::LXR, firstNode, self()->cg()->allocateFPRegisterPair(self()->getRealRegister(REGNUM(ai_l)), self()->getRealRegister(REGNUM(ai))),
self()->cg()->allocateFPRegisterPair(self()->getRealRegister(REGNUM(regNum+2)),self()->getRealRegister(REGNUM(regNum))), (TR::Instruction *) cursor);
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
freeScratchable.reset(ai);
freeScratchable.reset(ai_l);
freeScratchable.set(regNum);
freeScratchable.set(regNum+2);
}
#endif
else
{
if (dtype == TR::Int64 && TR::Compiler->target.is32Bit())
{
cursor = generateRSInstruction(self()->cg(), TR::InstOpCode::SLLG, firstNode, self()->getRealRegister(REGNUM(ai)),
self()->getRealRegister(regNum), 32, (TR::Instruction *) cursor);
if (regNum != ai)
{
freeScratchable.set(regNum);
}
freeScratchable.reset(ai);
// Figure out if the low word is passed in a reg or in memory
if (fullLong)
{
cursor = generateRRInstruction(self()->cg(), TR::InstOpCode::LR, firstNode, self()->getRealRegister(REGNUM(ai)),
self()->getRealRegister(REGNUM(regNum + 1)), (TR::Instruction *) cursor);
freeScratchable.set(regNum + 1);
}
else
{
cursor = generateRXInstruction(self()->cg(), TR::InstOpCode::L, firstNode, self()->getRealRegister(REGNUM(ai)),
generateS390MemoryReference(stackPtr, offset + 4, self()->cg()), (TR::Instruction *) cursor);
}
// Don't do anything for the low word later on as it was handled here
//
skipLong = true;
}
else
{
if (self()->cg()->supportsHighWordFacility() && self()->getRealRegister(REGNUM(ai))->isHighWordRegister())
{
cursor = generateExtendedHighWordInstruction(firstNode, self()->cg(), TR::InstOpCode::LHLR, self()->getRealRegister(REGNUM(ai)),
self()->getRealRegister(regNum), 0, (TR::Instruction *) cursor);
}
else
{
cursor = generateRRInstruction(self()->cg(), TR::InstOpCode::getLoadRegOpCode(), firstNode, self()->getRealRegister(REGNUM(ai)),
self()->getRealRegister(regNum), (TR::Instruction *) cursor);
}
freeScratchable.reset(ai);
freeScratchable.set(regNum);
}
((TR::Instruction*)cursor)->setBinLocalFreeRegs(binLocalRegs);
}
}
// Global register is not available, remember this for later
//
else
{
// Deal with the fact that the global register is not available
// We have to handle the high and low word. We use two entries
// in the busyMoves to represent high and low word.
//
if (dtype == TR::Int64 && TR::Compiler->target.is32Bit())
{
if (fullLong)
{
busyMoves[0][busyIndex] = regNum;
busyMoves[1][busyIndex] = ai;
busyMoves[2][busyIndex] = 6;
busyIndex++;
busyMoves[0][busyIndex] = regNum+1;
busyMoves[1][busyIndex] = ai;
busyMoves[2][busyIndex] = 0;
busyIndex++;
}
else
{
busyMoves[0][busyIndex] = regNum;
busyMoves[1][busyIndex] = ai;
busyMoves[2][busyIndex] = 7;
busyIndex++;
busyMoves[0][busyIndex] = offset + 4;
busyMoves[1][busyIndex] = ai;
busyMoves[2][busyIndex] = 0;
busyIndex++;
}
}
else
{
busyMoves[0][busyIndex] = regNum;
busyMoves[1][busyIndex] = ai;
if (dtype == TR::Float
|| dtype == TR::Double
#ifdef J9_PROJECT_SPECIFIC
|| dtype == TR::DecimalFloat
|| dtype == TR::DecimalDouble
#endif
)
{
busyMoves[2][busyIndex] = 5;
}
else
{
busyMoves[2][busyIndex] = 0;
}
busyIndex++;
}
} // if ai is free scrachable or else..
} // if regNum !=ai