-
Notifications
You must be signed in to change notification settings - Fork 752
/
Copy pathdecomp.cpp
2547 lines (2154 loc) · 94.5 KB
/
decomp.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) 1991, 2022 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 https://www.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
*******************************************************************************/
#include <string.h>
#include "j9.h"
#include "j9protos.h"
#include "j9consts.h"
#include "j9cp.h"
#include "rommeth.h"
#include "jilconsts.h"
#include "jitprotos.h"
#include "j9protos.h"
#include "stackwalk.h"
#include "MethodMetaData.h"
#include "pcstack.h"
#include "ut_j9codertvm.h"
#include "jitregmap.h"
#include "pcstack.h"
#include "VMHelpers.hpp"
#include "OMR/Bytes.hpp"
#if defined(OSX) && defined(AARCH64)
#include <pthread.h> // for pthread_jit_write_protect_np
#endif
extern "C" {
/* Generic rounding macro - result is a UDATA */
#define ROUND_TO(granularity, number) OMR::align((UDATA)(number), granularity)
typedef struct {
J9JITExceptionTable * metaData;
J9Method * method;
UDATA * bp;
UDATA * a0;
UDATA * unwindSP;
UDATA * sp;
UDATA argCount;
J9Method * literals;
J9I2JState i2jState;
UDATA * j2iFrame;
UDATA preservedRegisterValues[J9SW_JIT_CALLEE_PRESERVED_SIZE];
UDATA previousFrameBytecodes;
UDATA notifyFramePop;
UDATA resolveFrameFlags;
} J9JITDecompileState;
/* OSR result codes */
#define OSR_OK 0
#define OSR_OUT_OF_MEMORY 1
/* Bit values for J9OSRFrame->flags */
#define J9OSRFRAME_NOTIFY_FRAME_POP 1
typedef struct {
J9VMThread *targetThread;
J9JITExceptionTable *metaData;
void *jitPC;
UDATA resolveFrameFlags;
UDATA *objectArgScanCursor;
UDATA *objectTempScanCursor;
J9JITStackAtlas *gcStackAtlas;
J9Method *method;
U_8 *liveMonitorMap;
U_16 numberOfMapBits;
void *inlineMap;
void *inlinedCallSite;
J9OSRFrame *osrFrame;
} J9OSRData;
extern void _fsdSwitchToInterpPatchEntry(void *);
extern void _fsdRestoreToJITPatchEntry(void *);
J9_EXTERN_BUILDER_SYMBOL(jitExitInterpreter0);
J9_EXTERN_BUILDER_SYMBOL(jitExitInterpreter1);
J9_EXTERN_BUILDER_SYMBOL(jitExitInterpreterD);
J9_EXTERN_BUILDER_SYMBOL(jitExitInterpreterF);
J9_EXTERN_BUILDER_SYMBOL(jitExitInterpreterJ);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileOnReturn0);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileOnReturn1);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileOnReturnD);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileOnReturnF);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileOnReturnJ);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileOnReturnL);
J9_EXTERN_BUILDER_SYMBOL(jitReportExceptionCatch);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileAtExceptionCatch);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileAtCurrentPC);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileBeforeMethodMonitorEnter);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileBeforeReportMethodEnter);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileAfterAllocation);
J9_EXTERN_BUILDER_SYMBOL(jitDecompileAfterMonitorEnter);
J9_EXTERN_BUILDER_SYMBOL(executeCurrentBytecodeFromJIT);
J9_EXTERN_BUILDER_SYMBOL(enterMethodMonitorFromJIT);
J9_EXTERN_BUILDER_SYMBOL(reportMethodEnterFromJIT);
J9_EXTERN_BUILDER_SYMBOL(handlePopFramesFromJIT);
static J9OSRFrame* findOSRFrameAtInlineDepth(J9OSRBuffer *osrBuffer, UDATA inlineDepth);
static void jitFramePopNotificationAdded(J9VMThread * currentThread, J9StackWalkState * walkState, UDATA inlineDepth);
static void decompPrintMethod(J9VMThread * currentThread, J9Method * method);
static UDATA decompileAllFrameIterator(J9VMThread * currentThread, J9StackWalkState * walkState);
static J9JITDecompilationInfo * deleteDecompilationForExistingFrame(J9VMThread * decompileThread, J9JITDecompilationInfo * info);
static J9JITDecompilationInfo * addDecompilation(J9VMThread * currentThread, J9StackWalkState * walkState, UDATA reason);
static void removeAllBreakpoints(J9VMThread * currentThread);
static void buildBytecodeFrame(J9VMThread *currentThread, J9OSRFrame *osrFrame);
static void buildInlineStackFrames(J9VMThread *currentThread, J9JITDecompileState *decompileState, J9JITDecompilationInfo *decompRecord, UDATA inlineDepth, J9OSRFrame *osrFrame);
static void performDecompile(J9VMThread * currentThread, J9JITDecompileState * decompileState, J9JITDecompilationInfo * decompRecord, J9OSRFrame *osrFrame, UDATA numberOfFrames);
static void decompileOuterFrame(J9VMThread * currentThread, J9JITDecompileState * decompileState, J9JITDecompilationInfo * decompRecord, J9OSRFrame *osrFrame);
static void markMethodBreakpointed(J9VMThread * currentThread, J9JITBreakpointedMethod * breakpointedMethod);
static UDATA codeBreakpointAddedFrameIterator(J9VMThread * currentThread, J9StackWalkState * walkState);
static void decompileAllMethodsInAllStacks(J9VMThread * currentThread, UDATA reason);
static void markMethodUnbreakpointed(J9VMThread * currentThread, J9JITBreakpointedMethod * breakpointedMethod);
static void reinstallAllBreakpoints(J9VMThread * currentThread);
static UDATA decompileMethodFrameIterator(J9VMThread * currentThread, J9StackWalkState * walkState);
static void deleteAllDecompilations(J9VMThread * currentThread, UDATA reason, J9Method * method);
static void freeDecompilationRecord(J9VMThread * decompileThread, J9JITDecompilationInfo * info, UDATA retain);
static UDATA osrAllFramesSize(J9VMThread *currentThread, J9JITExceptionTable *metaData, void *jitPC, UDATA resolveFrameFlags);
static UDATA performOSR(J9VMThread *currentThread, J9StackWalkState *walkState, J9OSRBuffer *osrBuffer, U_8 *osrScratchBuffer, UDATA scratchBufferSize, UDATA jitStackFrameSize, UDATA *mustDecompile);
static UDATA* jitLocalSlotAddress(J9VMThread * currentThread, J9StackWalkState *walkState, UDATA slot, UDATA inlineDepth);
static void jitResetAllMethods(J9VMThread *currentThread);
static void fixStackForNewDecompilation(J9VMThread * currentThread, J9StackWalkState * walkState, J9JITDecompilationInfo *info, UDATA reason, J9JITDecompilationInfo **link);
static UDATA roundedOSRScratchBufferSize(J9VMThread * currentThread, J9JITExceptionTable *metaData, void *jitPC);
static j9object_t* getObjectSlotAddress(J9OSRData *osrData, U_16 slot);
static UDATA createMonitorEnterRecords(J9VMThread *currentThread, J9OSRData *osrData);
static UDATA initializeOSRFrame(J9VMThread *currentThread, J9OSRData *osrData);
static UDATA initializeOSRBuffer(J9VMThread *currentThread, J9OSRBuffer *osrBuffer, J9OSRData *osrData);
static UDATA getPendingStackHeight(J9VMThread *currentThread, U_8 *interpreterPC, J9Method *ramMethod, UDATA resolveFrameFlags);
static J9JITDecompilationInfo* jitAddDecompilationForFramePop(J9VMThread * currentThread, J9StackWalkState * walkState);
static J9JITDecompilationInfo* fetchAndUnstackDecompilationInfo(J9VMThread *currentThread);
static void fixSavedPC(J9VMThread *currentThread, J9JITDecompilationInfo *decompRecord);
static void dumpStack(J9VMThread *currentThread, char const *msg);
static J9ROMNameAndSignature* getNASFromInvoke(U_8 *bytecodePC, J9ROMClass *romClass);
/**
* Get the J9ROMNameAndSignature for an invoke bytecode.
*
* @param[in] bytecodePC the PC of the invoke
* @param[in] romClass the J9ROMClass containing the invoke bytecode
*
* @return the J9ROMNameAndSignature referenced by the invoke
*/
static J9ROMNameAndSignature*
getNASFromInvoke(U_8 *bytecodePC, J9ROMClass *romClass)
{
U_16 cpIndex = *(U_16*)(bytecodePC + 1);
J9ROMNameAndSignature* nameAndSig = NULL;
U_8 bytecode = *bytecodePC;
if (JBinvokedynamic == bytecode) {
/* Convert from callSites table index to actual cpIndex by probing the
* J9ROMClass->callSiteData table. That data is layed out as:
* callSiteCount x SRP to: J9ROMNameAndSignature, callSiteCount x U16, bsmCount x J9BSMData
*/
J9SRP *callSiteData = (J9SRP *) J9ROMCLASS_CALLSITEDATA(romClass);
nameAndSig = SRP_PTR_GET(callSiteData + cpIndex, J9ROMNameAndSignature*);
} else {
switch(bytecode) {
case JBinvokeinterface2:
cpIndex = *(U_16*)(bytecodePC + 3);
break;
case JBinvokestaticsplit:
cpIndex = *(J9ROMCLASS_STATICSPLITMETHODREFINDEXES(romClass) + cpIndex);
break;
case JBinvokespecialsplit:
cpIndex = *(J9ROMCLASS_SPECIALSPLITMETHODREFINDEXES(romClass) + cpIndex);
break;
}
J9ROMMethodRef * romMethodRef = ((J9ROMMethodRef *) &(J9_ROM_CP_FROM_ROM_CLASS(romClass)[cpIndex]));
nameAndSig = J9ROMMETHODREF_NAMEANDSIGNATURE(romMethodRef);
}
return nameAndSig;
}
/**
* Pop the top of the decompilation stack.
*
* @param[in] currentThread the current J9VMThread
*
* @return the top element from the decompilation stack
*/
static J9JITDecompilationInfo*
fetchAndUnstackDecompilationInfo(J9VMThread *currentThread)
{
J9JITDecompilationInfo *decompRecord = currentThread->decompilationStack;
currentThread->decompilationStack = decompRecord->next;
return decompRecord;
}
/**
* Restore the PC from a decompilation record to its original location.
*
* @param[in] currentThread the current J9VMThread
* @param[in] decompRecord the decompilation record
*/
static void
fixSavedPC(J9VMThread *currentThread, J9JITDecompilationInfo *decompRecord)
{
*decompRecord->pcAddress = decompRecord->pc;
}
/**
* If the verbose stack dumper is enabled, dump the stack of the current thread.
*
* @param[in] currentThread the current J9VMThread
* @param[in] msg the header message for the stack dump
*/
static void
dumpStack(J9VMThread *currentThread, char const *msg)
{
J9JavaVM *vm = currentThread->javaVM;
if (NULL != vm->verboseStackDump) {
vm->verboseStackDump(currentThread, msg);
}
}
static void
decompPrintMethod(J9VMThread * currentThread, J9Method * method)
{
PORT_ACCESS_FROM_VMC(currentThread);
J9UTF8 * className = J9ROMCLASS_CLASSNAME(UNTAGGED_METHOD_CP(method)->ramClass->romClass);
J9ROMMethod * romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(method);
J9UTF8 * name = J9ROMMETHOD_NAME(romMethod);
J9UTF8 * sig = J9ROMMETHOD_SIGNATURE(romMethod);
Trc_Decomp_printMethod(currentThread, method, J9UTF8_LENGTH(className), J9UTF8_DATA(className), J9UTF8_LENGTH(name), J9UTF8_DATA(name), J9UTF8_LENGTH(sig), J9UTF8_DATA(sig));
}
static void
jitResetAllMethods(J9VMThread *currentThread)
{
J9JavaVM * vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
J9Class * clazz = NULL;
J9ClassWalkState state;
/* First mark every compiled method for retranslation and invalidate the translation */
clazz = vmFuncs->allClassesStartDo(&state, vm, NULL);
while (clazz != NULL) {
J9Method *method = clazz->ramMethods;
U_32 methodCount = clazz->romClass->romMethodCount;
#if defined(OSX) && defined(AARCH64)
pthread_jit_write_protect_np(0);
#endif
while (methodCount != 0) {
UDATA extra = (UDATA)method->extra;
if (0 == (extra & J9_STARTPC_NOT_TRANSLATED)) {
/* Do not reset JIT INLs (currently in FSD there are no compiled JNI natives) */
if (0 == (J9_ROM_METHOD_FROM_RAM_METHOD(method)->modifiers & J9AccNative)) {
J9JITExceptionTable *metaData = vm->jitConfig->jitGetExceptionTableFromPC(currentThread, extra);
if (NULL != metaData) {
/* 0xCC is the "int3" instruction on x86.
* This will cause a crash if this instruction is executed.
* On other platforms, this will have unknown behaviour (likely a crash).
*/
*(U_8*)method->extra = 0xCC;
}
vmFuncs->initializeMethodRunAddress(currentThread, method);
}
}
method += 1;
methodCount -= 1;
}
#if defined(OSX) && defined(AARCH64)
pthread_jit_write_protect_np(1);
#endif
clazz = vmFuncs->allClassesNextDo(&state);
}
vmFuncs->allClassesEndDo(&state);
/* Now fix all the JIT vTables */
clazz = vmFuncs->allClassesStartDo(&state, vm, NULL);
while (clazz != NULL) {
/* Interface classes do not have vTables, so skip them */
if (!J9ROMCLASS_IS_INTERFACE(clazz->romClass)) {
UDATA *vTableWriteCursor = JIT_VTABLE_START_ADDRESS(clazz);
J9VTableHeader *vTableHeader = J9VTABLE_HEADER_FROM_RAM_CLASS(clazz);
J9Method **vTableReadCursor = J9VTABLE_FROM_HEADER(vTableHeader);
UDATA vTableSize = vTableHeader->size;
/* Put invalid entries in the obsolete JIT vTables and reinitialize the current ones */
if (J9_IS_CLASS_OBSOLETE(clazz)) {
while (0 != vTableSize) {
*vTableWriteCursor = (UDATA)-1;
vTableWriteCursor -= 1;
vTableSize -= 1;
}
} else {
while (0 != vTableSize) {
J9Method *method = *vTableReadCursor;
vTableReadCursor += 1;
vmFuncs->fillJITVTableSlot(currentThread, vTableWriteCursor, method);
vTableWriteCursor -= 1;
vTableSize -= 1;
}
}
}
clazz = vmFuncs->allClassesNextDo(&state);
}
vmFuncs->allClassesEndDo(&state);
}
#if (defined(J9VM_INTERP_HOT_CODE_REPLACEMENT)) /* priv. proto (autogen) */
J9JITDecompilationInfo *
jitCleanUpDecompilationStack(J9VMThread * currentThread, J9StackWalkState * walkState, UDATA dropCurrentFrame)
{
PORT_ACCESS_FROM_VMC(currentThread);
J9JITDecompilationInfo * current;
J9JITDecompilationInfo * currentFrameDecompile = NULL;
current = currentThread->decompilationStack;
while (current != walkState->decompilationStack) {
J9JITDecompilationInfo * temp = current;
if (!dropCurrentFrame) {
if (current->bp == walkState->bp) {
currentFrameDecompile = current;
break;
}
}
current = current->next;
freeDecompilationRecord(currentThread, temp, FALSE);
}
currentThread->decompilationStack = current;
return currentFrameDecompile;
}
#endif /* J9VM_INTERP_HOT_CODE_REPLACEMENT (autogen) */
void
jitCodeBreakpointAdded(J9VMThread * currentThread, J9Method * method)
{
PORT_ACCESS_FROM_VMC(currentThread);
J9JITConfig * jitConfig = currentThread->javaVM->jitConfig;
J9JITBreakpointedMethod * breakpointedMethod;
J9JITBreakpointedMethod * breakpointedMethods = jitConfig->breakpointedMethods;
J9VMThread * loopThread;
/* Called under exclusive access, so no mutex required */
Trc_Decomp_jitCodeBreakpointAdded_Entry(currentThread, method);
decompPrintMethod(currentThread, method);
breakpointedMethod = breakpointedMethods;
while (breakpointedMethod) {
if (breakpointedMethod->method == method) {
++(breakpointedMethod->count);
Trc_Decomp_jitCodeBreakpointAdded_incCount(currentThread, breakpointedMethod->count);
return;
}
breakpointedMethod = breakpointedMethod->link;
}
Trc_Decomp_jitCodeBreakpointAdded_newEntry(currentThread);
breakpointedMethod = (J9JITBreakpointedMethod *) j9mem_allocate_memory(sizeof(J9JITBreakpointedMethod), OMRMEM_CATEGORY_JIT);
if (!breakpointedMethod) {
j9tty_printf(PORTLIB, "\n*** alloc failure in jitPermanentBreakpointAdded ***\n");
Assert_Decomp_breakpointFailed();
}
breakpointedMethod->link = breakpointedMethods;
jitConfig->breakpointedMethods = breakpointedMethod;
breakpointedMethod->method = method;
breakpointedMethod->count = 1;
markMethodBreakpointed(currentThread, breakpointedMethod);
Trc_Decomp_jitCodeBreakpointAdded_hasBeenTranslated(currentThread, breakpointedMethod->hasBeenTranslated);
loopThread = currentThread;
do {
J9StackWalkState walkState;
walkState.userData1 = method;
walkState.flags = J9_STACKWALK_ITERATE_FRAMES | J9_STACKWALK_SKIP_INLINES | J9_STACKWALK_VISIBLE_ONLY | J9_STACKWALK_ITERATE_HIDDEN_JIT_FRAMES | J9_STACKWALK_MAINTAIN_REGISTER_MAP;
walkState.skipCount = 0;
walkState.frameWalkFunction = codeBreakpointAddedFrameIterator;
walkState.walkThread = loopThread;
currentThread->javaVM->walkStackFrames(currentThread, &walkState);
} while ((loopThread = loopThread->linkNext) != currentThread);
Trc_Decomp_jitCodeBreakpointAdded_Exit(currentThread);
}
void
jitCodeBreakpointRemoved(J9VMThread * currentThread, J9Method * method)
{
PORT_ACCESS_FROM_VMC(currentThread);
J9JITConfig * jitConfig = currentThread->javaVM->jitConfig;
J9JITBreakpointedMethod ** previous = &(jitConfig->breakpointedMethods);
J9JITBreakpointedMethod * breakpointedMethod;
/* Called under exclusive access, so no mutex required */
Trc_Decomp_jitCodeBreakpointRemoved_Entry(currentThread, method);
decompPrintMethod(currentThread, method);
while ((breakpointedMethod = *previous) != NULL) {
if (breakpointedMethod->method == method) {
UDATA count;
if ( (count = --(breakpointedMethod->count)) == 0) {
Trc_Decomp_jitCodeBreakpointAdded_fixingMethods(currentThread);
markMethodUnbreakpointed(currentThread, breakpointedMethod);
*previous = breakpointedMethod->link;
j9mem_free_memory(breakpointedMethod);
deleteAllDecompilations(currentThread, JITDECOMP_CODE_BREAKPOINT, method);
}
Trc_Decomp_jitCodeBreakpointRemoved_decCount(currentThread, count);
return;
}
previous = &(breakpointedMethod->link);
}
Trc_Decomp_jitCodeBreakpointAdded_Failed(currentThread);
}
static UDATA
codeBreakpointAddedFrameIterator(J9VMThread * currentThread, J9StackWalkState * walkState)
{
/* Decompile JIT frames running the breakpointed method */
if (walkState->jitInfo && (walkState->method == (J9Method *) walkState->userData1)) {
addDecompilation(currentThread, walkState, JITDECOMP_CODE_BREAKPOINT);
}
return J9_STACKWALK_KEEP_ITERATING;
}
#if (defined(J9VM_INTERP_HOT_CODE_REPLACEMENT)) /* priv. proto (autogen) */
void
jitHotswapOccurred(J9VMThread * currentThread)
{
/* We have exclusive */
Trc_Decomp_jitHotswapOccurred_Entry(currentThread);
/* Remove all breakpoints before resetting the methods */
removeAllBreakpoints(currentThread);
/* Find every method which has been translated and mark it for retranslation */
jitResetAllMethods(currentThread);
/* Reinstall the breakpoints */
reinstallAllBreakpoints(currentThread);
/* Mark every JIT method in every stack for decompilation */
decompileAllMethodsInAllStacks(currentThread, JITDECOMP_HOTSWAP);
Trc_Decomp_jitHotswapOccurred_Exit(currentThread);
}
#endif /* J9VM_INTERP_HOT_CODE_REPLACEMENT (autogen) */
void
jitDecompileMethod(J9VMThread * currentThread, J9JITDecompilationInfo * decompRecord)
{
J9JITDecompileState decompileState;
J9StackWalkState walkState;
J9OSRBuffer *osrBuffer = &decompRecord->osrBuffer;
UDATA numberOfFrames = osrBuffer->numberOfFrames;
J9OSRFrame *osrFrame = (J9OSRFrame*)(osrBuffer + 1);
/* Collect the required information from the stack - top visible frame is the decompile frame */
walkState.flags = J9_STACKWALK_ITERATE_FRAMES | J9_STACKWALK_SKIP_INLINES | J9_STACKWALK_VISIBLE_ONLY | J9_STACKWALK_MAINTAIN_REGISTER_MAP | J9_STACKWALK_ITERATE_HIDDEN_JIT_FRAMES | J9_STACKWALK_SAVE_STACKED_REGISTERS;
walkState.skipCount = 0;
walkState.frameWalkFunction = decompileMethodFrameIterator;
walkState.walkThread = currentThread;
walkState.userData1 = &decompileState;
walkState.userData2 = NULL;
currentThread->javaVM->walkStackFrames(currentThread, &walkState);
performDecompile(currentThread, &decompileState, decompRecord, osrFrame, numberOfFrames);
freeDecompilationRecord(currentThread, decompRecord, TRUE);
}
/**
* Find the pending stack height for a frame.
*
* @param[in] *currentThread current thread
* @param[in] *interpreterP the bytecoded PC
* @param[in] *method the J9Method
* @param[in] resolveFrameFlags the flags of the preceding resolve frame, or 0 if not preceded by a resolve frame
*
* @return the pending stack height
*/
static UDATA
getPendingStackHeight(J9VMThread *currentThread, U_8 *interpreterPC, J9Method *ramMethod, UDATA resolveFrameFlags)
{
UDATA pendingStackHeight = 0;
/* If the JIT frame has not been built, the pending stack height is 0. If we're at an exception catch,
* the height is 0 because the decompile return point will push the pending exception.
*/
UDATA resolveFrameType = resolveFrameFlags & J9_STACK_FLAGS_JIT_FRAME_SUB_TYPE_MASK;
switch(resolveFrameType) {
case J9_STACK_FLAGS_JIT_STACK_OVERFLOW_RESOLVE_FRAME:
case J9_STACK_FLAGS_JIT_EXCEPTION_CATCH_RESOLVE:
break;
default:
J9ROMClass *romClass = J9_CLASS_FROM_METHOD(ramMethod)->romClass;
J9ROMMethod * originalROMMethod = getOriginalROMMethod(ramMethod);
UDATA offsetPC = interpreterPC - J9_BYTECODE_START_FROM_RAM_METHOD(ramMethod);
J9JavaVM *vm = currentThread->javaVM;
J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
J9PortLibrary *portLibrary = vm->portLibrary;
U_8 bytecode = *interpreterPC;
/* Use the stack mapper to determine the pending stack height */
pendingStackHeight = (UDATA)vmFuncs->j9stackmap_StackBitsForPC(portLibrary, offsetPC, romClass, originalROMMethod, NULL, 0, NULL, NULL, NULL);
/* All invokes consider their arguments not to be pending - remove the arguments from the pending stack */
switch(bytecode) {
case JBinvokevirtual:
case JBinvokespecial:
case JBinvokespecialsplit:
case JBinvokeinterface:
case JBinvokeinterface2:
case JBinvokehandle:
case JBinvokehandlegeneric:
/* Remove implicit receiver from pending stack */
pendingStackHeight -= 1;
/* Intentional fall-through */
case JBinvokedynamic:
case JBinvokestatic:
case JBinvokestaticsplit:
/* Remove arguments from pending stack */
pendingStackHeight -= getSendSlotsFromSignature(J9UTF8_DATA(J9ROMNAMEANDSIGNATURE_SIGNATURE(getNASFromInvoke(interpreterPC, romClass))));
break;
}
/* Reduce the pending stack height for the resolve special cases */
switch (resolveFrameType) {
case J9_STACK_FLAGS_JIT_MONITOR_ENTER_RESOLVE:
/* Decompile after monitorenter completes. Remove the object from the pending stack. */
pendingStackHeight -= 1;
break;
case J9_STACK_FLAGS_JIT_ALLOCATION_RESOLVE:
/* Decompile after allocation completes. The JIT has not mapped the bytecode parameters in the pending stack */
switch (bytecode) {
case JBanewarray:
case JBnewarray: /* 1 slot (size) stacked */
pendingStackHeight -= 1;
break;
case JBmultianewarray: /* Dimensions stacked (number of dimensions is 3 bytes from the multianewarray) */
pendingStackHeight -= interpreterPC[3];
break;
case JBwithfield:
/* it will always be two slots since we only ever need to allocate qtype */
pendingStackHeight -= 2;
break;
case JBgetfield:
pendingStackHeight -= 1;
break;
default: /* JBnew/JBaconst_init - no stacked parameters*/
break;
}
}
}
Assert_CodertVM_true((IDATA)pendingStackHeight >= 0);
Trc_Decomp_decompileMethodFrameIterator_pendingCount(currentThread, pendingStackHeight);
return pendingStackHeight;
}
static UDATA
decompileMethodFrameIterator(J9VMThread * currentThread, J9StackWalkState * walkState)
{
J9JITDecompileState * decompileState = (J9JITDecompileState *) walkState->userData1;
Trc_Decomp_decompileMethodFrameIterator_Entry(currentThread);
/* If the decompile frame has already been passed, record the final information and stop walking */
if (walkState->userData2) {
if (walkState->jitInfo) {
UDATA * valueCursor = decompileState->preservedRegisterValues;
UDATA ** mapCursor = (UDATA **) &(walkState->registerEAs);
UDATA i;
decompileState->previousFrameBytecodes = FALSE;
for (i = 0; i < J9SW_JIT_CALLEE_PRESERVED_SIZE; ++i) {
UDATA regNumber = jitCalleeSavedRegisterList[i];
*(valueCursor++) = *(mapCursor[regNumber]);
}
Trc_Decomp_decompileMethodFrameIterator_previousIsJIT(currentThread);
} else {
Trc_Decomp_decompileMethodFrameIterator_previousIsBC(currentThread);
decompileState->previousFrameBytecodes = TRUE;
}
return J9_STACKWALK_STOP_ITERATING;
} else {
/* Current frame is the decompile frame - collect the preliminary info */
J9JITExceptionTable *metaData = walkState->jitInfo;
J9Method *method = walkState->method;
decompileState->metaData = metaData;
decompileState->method = method;
decompileState->sp = walkState->sp;
decompileState->argCount = walkState->outgoingArgCount;
Trc_Decomp_decompileMethodFrameIterator_outgoingArgCount(currentThread, decompileState->argCount);
decompileState->bp = walkState->bp;
decompileState->a0 = walkState->arg0EA;
decompileState->literals = method;
decompileState->unwindSP = walkState->unwindSP;
decompileState->j2iFrame = walkState->j2iFrame;
memcpy(&(decompileState->i2jState), walkState->i2jState, sizeof(J9I2JState));
decompileState->resolveFrameFlags = walkState->resolveFrameFlags;
/* Walk the next frame regardless of its visibility */
walkState->userData2 = (void *) 1;
walkState->flags &= ~J9_STACKWALK_VISIBLE_ONLY;
}
Trc_Decomp_decompileMethodFrameIterator_Exit(currentThread);
return J9_STACKWALK_KEEP_ITERATING;
}
/**
* Push a bytecode frame based on an OSR frame. Assumes that a bytecode frame
* (either pure or J2I) is already on the top of stack.
*
* @param[in] *currentThread current thread
* @param[in] *osrFrame the OSR frame from which to copy the information
*/
static void
buildBytecodeFrame(J9VMThread *currentThread, J9OSRFrame *osrFrame)
{
J9Method *method = osrFrame->method;
U_8 *bytecodePC = osrFrame->bytecodePCOffset + J9_BYTECODE_START_FROM_RAM_METHOD(method);
UDATA numberOfLocals = osrFrame->numberOfLocals;
UDATA maxStack = osrFrame->maxStack;
UDATA pendingStackHeight = osrFrame->pendingStackHeight;
UDATA *locals = ((UDATA*)(osrFrame + 1)) + maxStack;
UDATA *pending = locals - pendingStackHeight;
UDATA *sp = currentThread->sp;
UDATA *a0 = currentThread->arg0EA;
U_8 *pc = currentThread->pc;
J9Method *literals = currentThread->literals;
UDATA *newA0 = sp - 1;
J9SFStackFrame *stackFrame = NULL;
/* Push the locals */
sp -= numberOfLocals;
memcpy(sp, locals, numberOfLocals * sizeof(UDATA));
/* Push the stack frame */
stackFrame = (J9SFStackFrame*)sp - 1;
stackFrame->savedPC = pc;
stackFrame->savedCP = literals;
stackFrame->savedA0 = a0;
/* Push the pendings */
sp = (UDATA*)stackFrame - pendingStackHeight;
memcpy(sp, pending, pendingStackHeight * sizeof(UDATA));
/* Update the root values in the J9VMThread */
currentThread->arg0EA = newA0;
currentThread->pc = bytecodePC;
currentThread->literals = method;
currentThread->sp = sp;
}
/**
* Recursive helper for decompiling inlined frames.
*
* @param[in] *currentThread current thread
* @param[in] *decompileState the decompilation state copied from the stack walk
* @param[in] *decompRecord the decompilation record
* @param[in] inlineDepth the depth of inlining, 0 for the outer frame
* @param[in] *osrFrame the OSR frame from which to copy the information
*/
static void
buildInlineStackFrames(J9VMThread *currentThread, J9JITDecompileState *decompileState, J9JITDecompilationInfo *decompRecord, UDATA inlineDepth, J9OSRFrame *osrFrame)
{
J9JavaVM *vm = currentThread->javaVM;
J9MonitorEnterRecord *firstEnterRecord = osrFrame->monitorEnterRecords;
J9Method *method = osrFrame->method;
if (0 == inlineDepth) {
decompileOuterFrame(currentThread, decompileState, decompRecord, osrFrame);
} else {
J9OSRFrame *nextOSRFrame = (J9OSRFrame*)((U_8*)osrFrame + osrFrameSize(method));
buildInlineStackFrames(currentThread, decompileState, decompRecord, inlineDepth - 1, nextOSRFrame);
buildBytecodeFrame(currentThread, osrFrame);
}
/* Fix all of the monitor enter records for this frame to point to the new arg0EA.
* Filter out the record for the syncObject in synchronized methods. Only one such
* record will ever be detected in any frame. Link the remaining records into the list.
*/
if (NULL != firstEnterRecord) {
J9MonitorEnterRecord listHead;
J9MonitorEnterRecord *lastEnterRecord = &listHead;
J9MonitorEnterRecord *enterRecord = firstEnterRecord;
UDATA *arg0EA = currentThread->arg0EA;
j9object_t syncObject = NULL;
if (J9_ROM_METHOD_FROM_RAM_METHOD(method)->modifiers & J9AccSynchronized) {
syncObject = *(j9object_t*)(arg0EA - osrFrame->numberOfLocals + 1);
}
listHead.next = firstEnterRecord;
do {
J9MonitorEnterRecord *nextRecord = enterRecord->next;
if (enterRecord->object == syncObject) {
syncObject = NULL; /* Make sure syncObject isn't matched more than once */
lastEnterRecord->next = nextRecord;
pool_removeElement(currentThread->monitorEnterRecordPool, enterRecord);
} else {
enterRecord->arg0EA = CONVERT_TO_RELATIVE_STACK_OFFSET(currentThread, arg0EA);
lastEnterRecord = enterRecord;
}
enterRecord = nextRecord;
} while (NULL != enterRecord);
lastEnterRecord->next = currentThread->monitorEnterRecords;
currentThread->monitorEnterRecords = listHead.next;
}
/* If this frame has a notify frame pop pending, set the bit */
if (osrFrame->flags & J9OSRFRAME_NOTIFY_FRAME_POP) {
UDATA *bp = currentThread->arg0EA - osrFrame->numberOfLocals;
Trc_Decomp_performDecompile_addedPopNotification(currentThread, bp);
*bp |= J9SF_A0_REPORT_FRAME_POP_TAG;
}
}
/**
* Perform decompilation after gather information from the stack walk.
*
* @param[in] *currentThread current thread
* @param[in] *decompileState the decompilation state copied from the stack walk
* @param[in] *decompRecord the decompilation record
* @param[in] *osrFrame the first OSR frame to rebuild
* @param[in] numberOfFrames the total number of frames to rebuild
*/
static void
performDecompile(J9VMThread *currentThread, J9JITDecompileState *decompileState, J9JITDecompilationInfo *decompRecord, J9OSRFrame *osrFrame, UDATA numberOfFrames)
{
J9JavaVM *vm = currentThread->javaVM;
UDATA outgoingArgs[255];
UDATA outgoingArgCount = decompileState->argCount;
UDATA inlineDepth = numberOfFrames - 1;
Trc_Decomp_performDecompile_Entry(currentThread);
dumpStack(currentThread, "before decompilation");
if (FALSE == decompRecord->usesOSR) {
/* Not compiled with OSR - copy stack slots from JIT frame into OSR frame */
UDATA *jitTempBase = ((UDATA *) (((U_8 *) decompileState->bp) + ((J9JITStackAtlas *) decompileState->metaData->gcStackAtlas)->localBaseOffset)) + decompileState->metaData->tempOffset;
UDATA *osrTempBase = ((UDATA*)(osrFrame + 1)) + osrFrame->maxStack;
J9ROMMethod * romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(osrFrame->method);
UDATA argCount = J9_ARG_COUNT_FROM_ROM_METHOD(romMethod);
UDATA tempCount = osrFrame->numberOfLocals - argCount;
UDATA pendingStackHeight = osrFrame->pendingStackHeight;
/* Decompiling without OSR means old-style single-frame FSD */
Assert_CodertVM_true(vm->jitConfig->fsdEnabled);
Assert_CodertVM_true(1 == numberOfFrames);
/* The pending slots immediately precede the temps in both the OSR frame and the JIT frame, so copy them all at once */
memcpy(osrTempBase - pendingStackHeight, jitTempBase - pendingStackHeight, (tempCount + pendingStackHeight) * sizeof(UDATA));
}
/* Temporarily copy the outgoing arguments to the C stack */
memcpy(outgoingArgs, decompileState->sp, outgoingArgCount * sizeof(UDATA));
/* Rebuild the interpreter stack frames */
buildInlineStackFrames(currentThread, decompileState, decompRecord, inlineDepth, osrFrame);
/* Push the outgoing arguments onto the java stack */
currentThread->sp -= outgoingArgCount;
memcpy(currentThread->sp, outgoingArgs, outgoingArgCount * sizeof(UDATA));
Trc_Decomp_performDecompile_Exit(currentThread, currentThread->sp, currentThread->literals, currentThread->pc);
}
/**
* Decompile the outer (and possibly only) frame.
*
* @param[in] *currentThread current thread
* @param[in] *decompileState the decompilation state copied from the stack walk
* @param[in] *decompRecord the decompilation record
* @param[in] *osrFrame the OSR frame from which to copy the information
*/
static void
decompileOuterFrame(J9VMThread * currentThread, J9JITDecompileState * decompileState, J9JITDecompilationInfo * decompRecord, J9OSRFrame *osrFrame)
{
UDATA * newTempBase;
UDATA * oldTempBase;
UDATA * newPendingBase;
UDATA * oldPendingBase;
UDATA * stackFrame;
UDATA * newSP;
J9Method *method = osrFrame->method;
J9ROMMethod * romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(method);
UDATA argCount = J9_ARG_COUNT_FROM_ROM_METHOD(romMethod);
UDATA numberOfLocals = osrFrame->numberOfLocals;
UDATA tempCount = numberOfLocals - argCount;
U_8 ** jitReturnPCAddress = (U_8 **) &(((J9JITFrame *) (decompileState->bp))->returnPC);
U_8 * jitReturnPC = *jitReturnPCAddress;
UDATA * currentJ2iFrame = decompileState->j2iFrame;
UDATA pendingStackHeight = osrFrame->pendingStackHeight;
oldTempBase = ((UDATA*)(osrFrame + 1)) + osrFrame->maxStack;
/* Determine the shape of the new stack frame */
newTempBase = decompileState->a0 - numberOfLocals + 1;
if (decompileState->previousFrameBytecodes) {
/* Use the I2J returnSP in this case in order to account for the possible 8-alignment of the I2J args */
UDATA * correctTempBase = UNTAG2(decompileState->i2jState.returnSP, UDATA *) - numberOfLocals;
/* If the args were moved for alignment, copy them back to their original position */
if (newTempBase != correctTempBase) {
UDATA * newA0 = correctTempBase + numberOfLocals - 1;
memmove(correctTempBase + tempCount, newTempBase + tempCount, argCount * sizeof(UDATA));
newTempBase = correctTempBase;
decompileState->a0 = newA0;
}
stackFrame = (UDATA *) (((U_8 *) newTempBase) - sizeof(J9SFStackFrame));
} else {
stackFrame = (UDATA *) (((U_8 *) newTempBase) - sizeof(J9SFJ2IFrame));
}
newPendingBase = stackFrame - pendingStackHeight;
oldPendingBase = oldTempBase - pendingStackHeight;
newSP = newPendingBase;
/* If the JIT stack frame has not been constructed, don't attempt to read from it */
UDATA resolveFrameType = decompileState->resolveFrameFlags & J9_STACK_FLAGS_JIT_FRAME_SUB_TYPE_MASK;
if (J9_STACK_FLAGS_JIT_STACK_OVERFLOW_RESOLVE_FRAME == resolveFrameType) {
Trc_Decomp_performDecompile_monitorNotEntered(currentThread);
/* Temps have not been pushed yet - zero them and set up the sync object (if any) */
memset(newTempBase, 0, tempCount * sizeof(UDATA));
if (romMethod->modifiers & J9AccSynchronized) {
if (romMethod->modifiers & J9AccStatic) {
newTempBase[0] = (UDATA)J9VM_J9CLASS_TO_HEAPCLASS(J9_CLASS_FROM_METHOD(method));
} else {
newTempBase[0] = *(decompileState->a0);
}
} else if (J9ROMMETHOD_IS_NON_EMPTY_OBJECT_CONSTRUCTOR(romMethod)) {
newTempBase[0] = *(decompileState->a0);
}
} else {
/* Copy the temps to their new location */
memcpy(newTempBase, oldTempBase, tempCount * sizeof(UDATA));
}
/* Copy pending pushes */
memcpy(newPendingBase, oldPendingBase, pendingStackHeight * sizeof(UDATA));
/* Create the stack frame, either a pure bytecode frame or a J2I frame, depending on the previous frame. */
if (decompileState->previousFrameBytecodes) {
J9SFStackFrame * bytecodeFrame = (J9SFStackFrame *) stackFrame;
Trc_Decomp_performDecompile_buildingBCFrame(currentThread, stackFrame);
bytecodeFrame->savedPC = decompileState->i2jState.pc;
bytecodeFrame->savedCP = decompileState->i2jState.literals;
bytecodeFrame->savedA0 = decompileState->i2jState.a0;
} else {
J9SFJ2IFrame * j2iFrame = (J9SFJ2IFrame *) stackFrame;
char * returnChar;
J9JITDecompilationInfo * info;
Trc_Decomp_performDecompile_buildingJ2IFrame(currentThread, stackFrame);
memcpy(&(j2iFrame->i2jState), &(decompileState->i2jState), sizeof(J9I2JState));
memcpy(&(j2iFrame->J9SW_LOWEST_MEMORY_PRESERVED_REGISTER), decompileState->preservedRegisterValues, J9SW_JIT_CALLEE_PRESERVED_SIZE * sizeof(UDATA));
j2iFrame->specialFrameFlags = J9_STACK_FLAGS_JIT_CALL_IN_FRAME | J9_STACK_FLAGS_JIT_CALL_IN_TYPE_J2_I;
j2iFrame->returnAddress = jitReturnPC;
j2iFrame->previousJ2iFrame = currentJ2iFrame;
currentJ2iFrame = (UDATA *) &(j2iFrame->taggedReturnSP);
returnChar = (char *) J9UTF8_DATA(J9ROMMETHOD_SIGNATURE(romMethod));
while (*returnChar++ != ')') ;
switch(*returnChar) {
case 'V':
j2iFrame->exitPoint = J9_BUILDER_SYMBOL(jitExitInterpreter0);
break;
case 'D':
j2iFrame->exitPoint = J9_BUILDER_SYMBOL(jitExitInterpreterD);
break;
case 'F':
j2iFrame->exitPoint = J9_BUILDER_SYMBOL(jitExitInterpreterF);
break;
case 'J':
#ifdef J9VM_ENV_DATA64
case '[':
case 'L':
#endif
j2iFrame->exitPoint = J9_BUILDER_SYMBOL(jitExitInterpreterJ);
break;
default:
j2iFrame->exitPoint = J9_BUILDER_SYMBOL(jitExitInterpreter1);
break;
}
#ifdef J9SW_NEEDS_JIT_2_INTERP_CALLEE_ARG_POP
j2iFrame->taggedReturnSP = (UDATA *) (((U_8 *) (((UDATA *) (j2iFrame + 1)) + argCount + tempCount)));
#else
j2iFrame->taggedReturnSP = (UDATA *) (((U_8 *) (((UDATA *) (j2iFrame + 1)) + tempCount)));
#endif
/* If the next thing on the decompilation stack used to point to the return address save slot in the decompiled JIT frame, point it to the slot in the J2I frame. */
if ((info = currentThread->decompilationStack) != NULL) {
if (info->pcAddress == jitReturnPCAddress) {
Trc_Decomp_performDecompile_fixingDecompStack(currentThread, info, info->pcAddress, &(j2iFrame->returnAddress), info->pc);
info->pcAddress = &(j2iFrame->returnAddress);
}
}
}
/* Fill in vmThread values for bytecode execution */
currentThread->pc = osrFrame->bytecodePCOffset + J9_BYTECODE_START_FROM_RAM_METHOD(osrFrame->method);
currentThread->literals = decompileState->literals;
currentThread->arg0EA = decompileState->a0;
currentThread->sp = newSP;
currentThread->j2iFrame = currentJ2iFrame;
/* If the outer framed failed a method monitor enter, hide the interpreted version to prevent exception throw
* from exiting the monitor that was never entered.
*/
if (J9_STACK_FLAGS_JIT_FAILED_METHOD_MONITOR_ENTER_RESOLVE == resolveFrameType) {
newTempBase[-1] |= J9SF_A0_INVISIBLE_TAG;
}
}
/**
* Fix the java stack to account for a newly-added decompilation. This involves modifying
* the return address in the stack which would be used to return to the frame for which the
* decompilation was added.
*
* @param[in] *currentThread current thread
* @param[in] *walkState stack walk state (already at the OSR point)
* @param[in] *info the new decompilation record
* @param[in] reason the reason for the decompilation
* @param[in] **link pointer to the next pointer of the previous decompilation record