-
Notifications
You must be signed in to change notification settings - Fork 3.8k
/
mini-exceptions.c
3533 lines (3007 loc) · 103 KB
/
mini-exceptions.c
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
/**
* \file
* generic exception support
*
* Authors:
* Dietmar Maurer (dietmar@ximian.com)
* Mono Team (mono-list@lists.ximian.com)
*
* Copyright 2001-2003 Ximian, Inc.
* Copyright 2003-2008 Novell, Inc.
* Copyright 2011 Xamarin Inc (http://www.xamarin.com).
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include <config.h>
#include <glib.h>
#include <string.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#ifdef HAVE_UNWIND_H
#include <unwind.h>
#endif
#include <mono/metadata/appdomain.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
#include <mono/metadata/threads-types.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/exception.h>
#include <mono/metadata/exception-internals.h>
#include <mono/metadata/object-internals.h>
#include <mono/metadata/reflection-internals.h>
#include <mono/metadata/gc-internals.h>
#include <mono/metadata/debug-internals.h>
#include <mono/metadata/mono-debug.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/mono-endian.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/mono-mlist.h>
#include <mono/utils/mono-merp.h>
#include <mono/utils/mono-mmap.h>
#include <mono/utils/mono-logger-internals.h>
#include <mono/utils/mono-error.h>
#include <mono/utils/mono-error-internals.h>
#include "mini.h"
#include "trace.h"
#include "debugger-agent.h"
#include "seq-points.h"
#include "llvm-runtime.h"
#include "mini-llvm.h"
#include "aot-runtime.h"
#include "mini-runtime.h"
#include "interp/interp.h"
#ifdef ENABLE_LLVM
#include "mini-llvm-cpp.h"
#endif
#ifdef TARGET_ARM
#include "mini-arm.h"
#endif
#ifndef MONO_ARCH_CONTEXT_DEF
#define MONO_ARCH_CONTEXT_DEF
#endif
/*
* Raw frame information is stored in MonoException.trace_ips as an IntPtr[].
* This structure represents one entry.
* This should consists of pointers only.
*/
typedef struct
{
gpointer ip;
gpointer generic_info;
/* Only for interpreter frames */
MonoJitInfo *ji;
} ExceptionTraceIp;
/* Number of words in trace_ips belonging to one entry */
#define TRACE_IP_ENTRY_SIZE (sizeof (ExceptionTraceIp) / sizeof (gpointer))
static gpointer restore_context_func, call_filter_func;
static gpointer throw_exception_func, rethrow_exception_func;
static gpointer throw_corlib_exception_func;
static MonoFtnPtrEHCallback ftnptr_eh_callback;
static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
static gboolean mono_current_thread_has_handle_block_guard (void);
static gboolean mono_install_handler_block_guard (MonoThreadUnwindState *ctx);
static void mono_uninstall_current_handler_block_guard (void);
static gboolean
first_managed (MonoStackFrameInfo *frame, MonoContext *ctx, gpointer addr)
{
gpointer **data = (gpointer **)addr;
if (!frame->managed)
return FALSE;
if (!ctx) {
// FIXME: Happens with llvm_only
*data = NULL;
return TRUE;
}
*data = frame->frame_addr;
g_assert (*data);
return TRUE;
}
static gpointer
mono_thread_get_managed_sp (void)
{
gpointer addr = NULL;
mono_walk_stack (first_managed, MONO_UNWIND_SIGNAL_SAFE, &addr);
return addr;
}
static inline void
mini_clear_abort_threshold (void)
{
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
jit_tls->abort_exc_stack_threshold = NULL;
}
static inline void
mini_set_abort_threshold (StackFrameInfo *frame)
{
gpointer sp = frame->frame_addr;
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
// Only move it up, to avoid thrown/caught
// exceptions lower in the stack from triggering
// a rethrow
gboolean above_threshold = (gsize) sp >= (gsize) jit_tls->abort_exc_stack_threshold;
if (!jit_tls->abort_exc_stack_threshold || above_threshold) {
jit_tls->abort_exc_stack_threshold = sp;
}
}
// Note: In the case that the frame is above where the thread abort
// was set we bump the threshold so that functions called from the new,
// higher threshold don't trigger the thread abort exception
static inline gboolean
mini_above_abort_threshold (void)
{
gpointer sp = mono_thread_get_managed_sp ();
MonoJitTlsData *jit_tls = (MonoJitTlsData*) mono_tls_get_jit_tls ();
if (!sp)
return TRUE;
gboolean above_threshold = (gsize) sp >= (gsize) jit_tls->abort_exc_stack_threshold;
if (above_threshold)
jit_tls->abort_exc_stack_threshold = sp;
return above_threshold;
}
static int
mono_get_seq_point_for_native_offset (MonoDomain *domain, MonoMethod *method, gint32 native_offset)
{
SeqPoint sp;
if (mono_find_prev_seq_point_for_native_offset (domain, method, native_offset, NULL, &sp))
return sp.il_offset;
return -1;
}
void
mono_exceptions_init (void)
{
MonoRuntimeExceptionHandlingCallbacks cbs;
if (mono_ee_features.use_aot_trampolines) {
restore_context_func = mono_aot_get_trampoline ("restore_context");
call_filter_func = mono_aot_get_trampoline ("call_filter");
throw_exception_func = mono_aot_get_trampoline ("throw_exception");
rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
} else {
MonoTrampInfo *info;
restore_context_func = mono_arch_get_restore_context (&info, FALSE);
mono_tramp_info_register (info, NULL);
call_filter_func = mono_arch_get_call_filter (&info, FALSE);
mono_tramp_info_register (info, NULL);
throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
}
mono_arch_exceptions_init ();
cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
if (mono_llvm_only) {
cbs.mono_raise_exception = mono_llvm_raise_exception;
cbs.mono_reraise_exception = mono_llvm_reraise_exception;
} else {
cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
cbs.mono_reraise_exception = (void (*)(MonoException *))mono_get_rethrow_exception ();
}
cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
cbs.mono_exception_walk_trace = mono_exception_walk_trace;
cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
cbs.mono_uninstall_current_handler_block_guard = mono_uninstall_current_handler_block_guard;
cbs.mono_current_thread_has_handle_block_guard = mono_current_thread_has_handle_block_guard;
cbs.mono_clear_abort_threshold = mini_clear_abort_threshold;
cbs.mono_above_abort_threshold = mini_above_abort_threshold;
mono_install_eh_callbacks (&cbs);
mono_install_get_seq_point (mono_get_seq_point_for_native_offset);
}
gpointer
mono_get_throw_exception (void)
{
g_assert (throw_exception_func);
return throw_exception_func;
}
gpointer
mono_get_rethrow_exception (void)
{
g_assert (rethrow_exception_func);
return rethrow_exception_func;
}
gpointer
mono_get_call_filter (void)
{
g_assert (call_filter_func);
return call_filter_func;
}
gpointer
mono_get_restore_context (void)
{
g_assert (restore_context_func);
return restore_context_func;
}
gpointer
mono_get_throw_corlib_exception (void)
{
gpointer code = NULL;
MonoTrampInfo *info;
/* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
if (throw_corlib_exception_func)
return throw_corlib_exception_func;
if (mono_ee_features.use_aot_trampolines)
code = mono_aot_get_trampoline ("throw_corlib_exception");
else {
code = mono_arch_get_throw_corlib_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
}
mono_memory_barrier ();
throw_corlib_exception_func = code;
return throw_corlib_exception_func;
}
/*
* mono_get_throw_exception_addr:
*
* Return an address which stores the result of
* mono_get_throw_exception.
*/
gpointer
mono_get_throw_exception_addr (void)
{
return &throw_exception_func;
}
static gboolean
is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
{
MonoTryBlockHoleTableJitInfo *table;
int i;
guint32 offset;
guint16 clause;
if (ei->try_start > ip || ip >= ei->try_end)
return FALSE;
if (!ji->has_try_block_holes)
return TRUE;
table = mono_jit_info_get_try_block_hole_table_info (ji);
offset = (guint32)((char*)ip - (char*)ji->code_start);
clause = (guint16)(ei - ji->clauses);
g_assert (clause < ji->num_clauses);
for (i = 0; i < table->num_holes; ++i) {
MonoTryBlockHoleJitInfo *hole = &table->holes [i];
if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
return FALSE;
}
return TRUE;
}
#ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
#if 0
static gboolean show_native_addresses = TRUE;
#else
static gboolean show_native_addresses = FALSE;
#endif
static _Unwind_Reason_Code
build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
{
MonoDomain *domain = mono_domain_get ();
uintptr_t ip = _Unwind_GetIP (frame_ctx);
if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
GList **trace_ips = (GList **)state;
*trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
}
return _URC_NO_REASON;
}
static GSList*
get_unwind_backtrace (void)
{
GSList *ips = NULL;
_Unwind_Backtrace (build_stack_trace, &ips);
return g_slist_reverse (ips);
}
#else
static GSList*
get_unwind_backtrace (void)
{
return NULL;
}
#endif
static gboolean
arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *ji, MonoContext *ctx,
MonoContext *new_ctx, MonoLMF **lmf,
mgreg_t **save_locations,
StackFrameInfo *frame)
{
if (!ji && *lmf) {
if (((gsize)(*lmf)->previous_lmf) & 2) {
MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
memset (frame, 0, sizeof (StackFrameInfo));
frame->ji = ji;
*new_ctx = *ctx;
if (ext->debugger_invoke) {
/*
* This LMF entry is created by the soft debug code to mark transitions to
* managed code done during invokes.
*/
frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
} else if (ext->interp_exit) {
frame->type = FRAME_TYPE_INTERP_TO_MANAGED;
frame->interp_exit_data = ext->interp_exit_data;
} else {
g_assert_not_reached ();
}
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~3);
return TRUE;
}
}
return mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
}
/*
* find_jit_info:
*
* Translate between the mono_arch_unwind_frame function and the old API.
*/
static MonoJitInfo *
find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
{
StackFrameInfo frame;
MonoJitInfo *ji;
gboolean err;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
/* Avoid costly table lookup during stack overflow */
if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
ji = prev_ji;
else
ji = mini_jit_info_table_find (domain, ip, NULL);
if (managed)
*managed = FALSE;
err = arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
if (!err)
return (MonoJitInfo *)-1;
if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
/*
* Remove any unused lmf.
* Mask out the lower bits which might be used to hold additional information.
*/
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
}
/* Convert between the new and the old APIs */
switch (frame.type) {
case FRAME_TYPE_MANAGED:
if (managed)
*managed = TRUE;
return frame.ji;
case FRAME_TYPE_TRAMPOLINE:
return frame.ji;
case FRAME_TYPE_MANAGED_TO_NATIVE:
if (frame.ji)
return frame.ji;
else {
memset (res, 0, sizeof (MonoJitInfo));
res->d.method = frame.method;
return res;
}
case FRAME_TYPE_DEBUGGER_INVOKE: {
MonoContext tmp_ctx;
/*
* The normal exception handling code can't handle this frame, so just
* skip it.
*/
ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
return ji;
}
default:
g_assert_not_reached ();
return NULL;
}
}
/* mono_find_jit_info:
*
* This function is used to gather information from @ctx. It return the
* MonoJitInfo of the corresponding function, unwinds one stack frame and
* stores the resulting context into @new_ctx. It also stores a string
* describing the stack location into @trace (if not NULL), and modifies
* the @lmf if necessary. @native_offset return the IP offset from the
* start of the function or -1 if that info is not available.
*/
MonoJitInfo *
mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
gboolean *managed)
{
gboolean managed2;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
MonoJitInfo *ji;
MonoMethod *method = NULL;
if (trace)
*trace = NULL;
if (native_offset)
*native_offset = -1;
if (managed)
*managed = FALSE;
ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
if (ji == (gpointer)-1)
return ji;
if (ji && !ji->is_trampoline)
method = jinfo_get_method (ji);
if (managed2 || (method && method->wrapper_type)) {
const char *real_ip, *start;
gint32 offset;
start = (const char *)ji->code_start;
if (!managed2)
/* ctx->ip points into native code */
real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
else
real_ip = (const char*)ip;
if ((real_ip >= start) && (real_ip <= start + ji->code_size))
offset = real_ip - start;
else
offset = -1;
if (native_offset)
*native_offset = offset;
if (managed)
if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
*managed = TRUE;
if (trace)
*trace = mono_debug_print_stack_frame (method, offset, domain);
} else {
if (trace) {
char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
*trace = g_strdup_printf ("in (unmanaged) %s", fname);
g_free (fname);
}
}
return ji;
}
/*
* mono_find_jit_info_ext:
*
* A version of mono_find_jit_info which returns all data in the StackFrameInfo
* structure.
* A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
* - These frames are used to mark managed-to-native transitions, so CTX will refer to native
* code, and new_ctx will refer to the last managed frame. The caller should unwind once more
* to obtain the last managed frame.
* If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
* On return, it will be filled with the locations where callee saved registers are saved
* by the current frame. This is returned outside of StackFrameInfo because it can be
* quite large on some platforms.
* If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
* not be set.
*/
gboolean
mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf,
mgreg_t **save_locations,
StackFrameInfo *frame)
{
gboolean err;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
MonoJitInfo *ji;
MonoDomain *target_domain = domain;
MonoMethod *method = NULL;
gboolean async = mono_thread_info_is_async_context ();
if (trace)
*trace = NULL;
/* Avoid costly table lookup during stack overflow */
if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
ji = prev_ji;
else
ji = mini_jit_info_table_find (domain, ip, &target_domain);
if (!target_domain)
target_domain = domain;
if (save_locations)
memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
err = arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
if (!err)
return FALSE;
if (frame->type != FRAME_TYPE_INTERP_TO_MANAGED && *lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
/*
* Remove any unused lmf.
* Mask out the lower bits which might be used to hold additional information.
*/
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
}
if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
method = jinfo_get_method (frame->ji);
if (frame->type == FRAME_TYPE_MANAGED && method) {
if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
frame->managed = TRUE;
}
if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
/*
* This type of frame is just a marker, the caller should unwind once more to get the
* last managed frame.
*/
frame->ji = NULL;
frame->method = NULL;
}
frame->native_offset = -1;
frame->domain = target_domain;
frame->async_context = async;
frame->frame_addr = MONO_CONTEXT_GET_SP (ctx);
ji = frame->ji;
if (frame->type == FRAME_TYPE_MANAGED)
frame->method = method;
if (ji && (frame->managed || (method && method->wrapper_type))) {
const char *real_ip, *start;
start = (const char *)ji->code_start;
if (frame->type == FRAME_TYPE_MANAGED)
real_ip = (const char*)ip;
else
/* ctx->ip points into native code */
real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
if ((real_ip >= start) && (real_ip <= start + ji->code_size))
frame->native_offset = real_ip - start;
else {
frame->native_offset = -1;
}
if (trace)
*trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
} else {
if (trace && frame->method) {
char *fname = mono_method_full_name (frame->method, TRUE);
*trace = g_strdup_printf ("in (unmanaged) %s", fname);
g_free (fname);
}
}
return TRUE;
}
typedef struct {
gboolean in_interp;
MonoInterpStackIter interp_iter;
gpointer last_frame_addr;
} Unwinder;
static void
unwinder_init (Unwinder *unwinder)
{
memset (unwinder, 0, sizeof (Unwinder));
}
#if defined(__GNUC__) && defined(TARGET_ARM64)
/* gcc 4.9.2 seems to miscompile this on arm64 */
static __attribute__((optimize("O0"))) gboolean
#else
static gboolean
#endif
unwinder_unwind_frame (Unwinder *unwinder,
MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf,
mgreg_t **save_locations,
StackFrameInfo *frame)
{
gpointer parent;
if (unwinder->in_interp) {
memcpy (new_ctx, ctx, sizeof (MonoContext));
/* Process debugger invokes */
/* The DEBUGGER_INVOKE should be returned before the first interpreter frame for the invoke */
if (unwinder->last_frame_addr > (gpointer)(*lmf)) {
if (((gsize)(*lmf)->previous_lmf) & 2) {
MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
if (ext->debugger_invoke) {
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~7);
frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
return TRUE;
}
}
}
unwinder->in_interp = mini_get_interp_callbacks ()->frame_iter_next (&unwinder->interp_iter, frame);
if (frame->type == FRAME_TYPE_INTERP) {
parent = mini_get_interp_callbacks ()->frame_get_parent (frame->interp_frame);
unwinder->last_frame_addr = parent;
}
if (!unwinder->in_interp)
return unwinder_unwind_frame (unwinder, domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf, save_locations, frame);
return TRUE;
} else {
gboolean res = mono_find_jit_info_ext (domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf,
save_locations, frame);
if (!res)
return FALSE;
if (frame->type == FRAME_TYPE_INTERP_TO_MANAGED) {
unwinder->in_interp = TRUE;
mini_get_interp_callbacks ()->frame_iter_init (&unwinder->interp_iter, frame->interp_exit_data);
}
unwinder->last_frame_addr = frame->frame_addr;
return TRUE;
}
}
/*
* This function is async-safe.
*/
static gpointer
get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
{
MonoGenericJitInfo *gi;
MonoMethod *method;
gpointer info;
if (!ji->has_generic_jit_info)
return NULL;
gi = mono_jit_info_get_generic_jit_info (ji);
if (!gi->has_this)
return NULL;
info = NULL;
/*
* Search location list if available, it contains the precise location of the
* argument for every pc offset, even if the method was interrupted while it was in
* its prolog.
*/
if (gi->nlocs) {
int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
int i;
for (i = 0; i < gi->nlocs; ++i) {
MonoDwarfLocListEntry *entry = &gi->locations [i];
if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
if (entry->is_reg)
info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
else
info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
break;
}
}
g_assert (i < gi->nlocs);
} else {
if (gi->this_in_reg)
info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
else
info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
gi->this_offset);
}
method = jinfo_get_method (ji);
if (mono_method_get_context (method)->method_inst) {
/* A MonoMethodRuntimeGenericContext* */
return info;
} else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || m_class_is_valuetype (method->klass)) {
/* A MonoVTable* */
return info;
} else {
/* Avoid returning a managed object */
MonoObject *this_obj = (MonoObject *)info;
return this_obj->vtable;
}
}
/*
* generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
*/
static MonoGenericContext
get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
{
MonoGenericContext context = { NULL, NULL };
MonoClass *klass, *method_container_class;
MonoMethod *method;
g_assert (generic_info);
method = jinfo_get_method (ji);
g_assert (method->is_inflated);
if (mono_method_get_context (method)->method_inst) {
MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
klass = mrgctx->class_vtable->klass;
context.method_inst = mrgctx->method_inst;
g_assert (context.method_inst);
} else {
MonoVTable *vtable = (MonoVTable *)generic_info;
klass = vtable->klass;
}
//g_assert (!mono_class_is_gtd (method->klass));
if (mono_class_is_ginst (method->klass))
method_container_class = mono_class_get_generic_class (method->klass)->container_class;
else
method_container_class = method->klass;
/* class might refer to a subclass of method's class */
while (!(klass == method->klass || (mono_class_is_ginst (klass) && mono_class_get_generic_class (klass)->container_class == method_container_class))) {
klass = m_class_get_parent (klass);
g_assert (klass);
}
if (mono_class_is_ginst (klass) || mono_class_is_gtd (klass))
context.class_inst = mini_class_get_context (klass)->class_inst;
if (mono_class_is_ginst (klass))
g_assert (mono_class_has_parent_and_ignore_generics (mono_class_get_generic_class (klass)->container_class, method_container_class));
else
g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
return context;
}
static MonoMethod*
get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
{
ERROR_DECL (error);
MonoGenericContext context;
MonoMethod *method;
if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
return jinfo_get_method (ji);
context = get_generic_context_from_stack_frame (ji, generic_info);
method = jinfo_get_method (ji);
method = mono_method_get_declaring_generic_method (method);
method = mono_class_inflate_generic_method_checked (method, &context, error);
g_assert (mono_error_ok (error)); /* FIXME don't swallow the error */
return method;
}
/**
* mono_exception_walk_native_trace:
* \param ex The exception object whose frames should be walked
* \param func callback to call for each stack frame
* \param user_data data passed to the callback
* This function walks the stacktrace of an exception. For
* each frame the callback function is called with the relevant info.
* The walk ends when no more stack frames are found or when the callback
* returns a TRUE value.
*/
gboolean
mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
{
MONO_REQ_GC_UNSAFE_MODE;
MonoDomain *domain = mono_domain_get ();
MonoArray *ta = ex->trace_ips;
int len, i;
if (ta == NULL)
return FALSE;
len = mono_array_length (ta) / TRACE_IP_ENTRY_SIZE;
for (i = 0; i < len; i++) {
ExceptionTraceIp trace_ip;
memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
gpointer ip = trace_ip.ip;
gpointer generic_info = trace_ip.generic_info;
MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
if (ji == NULL) {
if (func (NULL, ip, 0, FALSE, user_data))
return TRUE;
} else {
MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
return TRUE;
}
}
return len > 0;
}
MonoArray *
ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
{
ERROR_DECL (error);
MonoDomain *domain = mono_domain_get ();
MonoArray *res;
MonoArray *ta = exc->trace_ips;
MonoDebugSourceLocation *location;
int i, len;
if (ta == NULL) {
/* Exception is not thrown yet */
res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, 0, error);
mono_error_set_pending_exception (error);
return res;
}
len = mono_array_length (ta) / TRACE_IP_ENTRY_SIZE;
res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0, error);
if (mono_error_set_pending_exception (error))
return NULL;
for (i = skip; i < len; i++) {
MonoJitInfo *ji;
MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, error);
if (!mono_error_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
ExceptionTraceIp trace_ip;
memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
gpointer ip = trace_ip.ip;
gpointer generic_info = trace_ip.generic_info;
MonoMethod *method;
if (trace_ip.ji) {
ji = trace_ip.ji;
} else {
ji = mono_jit_info_table_find (domain, ip);
if (ji == NULL) {
/* Unmanaged frame */
mono_array_setref (res, i, sf);
continue;
}
}
g_assert (ji != NULL);
if (mono_llvm_only || !generic_info)
/* Can't resolve actual method */
method = jinfo_get_method (ji);
else
method = get_method_from_stack_frame (ji, generic_info);
if (jinfo_get_method (ji)->wrapper_type) {
char *s;
sf->method = NULL;
s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
MonoString *name = mono_string_new_checked (domain, s, error);
g_free (s);
if (!is_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
MONO_OBJECT_SETREF (sf, internal_method_name, name);
}
else {
MonoReflectionMethod *rm = mono_method_get_object_checked (domain, method, NULL, error);
if (!mono_error_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
MONO_OBJECT_SETREF (sf, method, rm);
}
sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
sf->method_address = (gsize) ji->code_start;
sf->native_offset = (char *)ip - (char *)ji->code_start;
/*
* mono_debug_lookup_source_location() returns both the file / line number information
* and the IL offset. Note that computing the IL offset is already an expensive
* operation, so we shouldn't call this method twice.
*/
location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
if (location) {
sf->il_offset = location->il_offset;
} else {
SeqPoint sp;
if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
sf->il_offset = sp.il_offset;