-
Notifications
You must be signed in to change notification settings - Fork 408
/
Copy pathdbg_mlc.c
1218 lines (1103 loc) · 38.5 KB
/
dbg_mlc.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
/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
* Copyright (c) 1997 by Silicon Graphics. All rights reserved.
* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2007 Free Software Foundation, Inc
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
#include "private/dbg_mlc.h"
#ifndef MSWINCE
# include <errno.h>
#endif
#include <string.h>
#ifndef SHORT_DBG_HDRS
/* Check whether object with base pointer p has debugging info. */
/* p is assumed to point to a legitimate object in our part */
/* of the heap. */
/* This excludes the check as to whether the back pointer is */
/* odd, which is added by the GC_HAS_DEBUG_INFO macro. */
/* Note that if DBG_HDRS_ALL is set, uncollectible objects */
/* on free lists may not have debug information set. Thus it's */
/* not always safe to return TRUE (1), even if the client does */
/* its part. Return -1 if the object with debug info has been */
/* marked as deallocated. */
GC_INNER int GC_has_other_debug_info(ptr_t p)
{
ptr_t body = (ptr_t)((oh *)p + 1);
word sz = GC_size(p);
if (HBLKPTR(p) != HBLKPTR((ptr_t)body)
|| sz < DEBUG_BYTES + EXTRA_BYTES) {
return 0;
}
if (((oh *)p) -> oh_sf != (START_FLAG ^ (word)body)
&& ((word *)p)[BYTES_TO_WORDS(sz)-1] != (END_FLAG ^ (word)body)) {
return 0;
}
if (((oh *)p)->oh_sz == sz) {
/* Object may have had debug info, but has been deallocated */
return -1;
}
return 1;
}
#endif /* !SHORT_DBG_HDRS */
#ifdef KEEP_BACK_PTRS
# include <stdlib.h>
# if defined(__GLIBC__) || defined(SOLARIS) \
|| defined(HPUX) || defined(IRIX5) || defined(OSF1)
# define RANDOM() random()
# else
# define RANDOM() (long)rand()
# endif
/* Store back pointer to source in dest, if that appears to be possible. */
/* This is not completely safe, since we may mistakenly conclude that */
/* dest has a debugging wrapper. But the error probability is very */
/* small, and this shouldn't be used in production code. */
/* We assume that dest is the real base pointer. Source will usually */
/* be a pointer to the interior of an object. */
GC_INNER void GC_store_back_pointer(ptr_t source, ptr_t dest)
{
if (GC_HAS_DEBUG_INFO(dest)) {
((oh *)dest) -> oh_back_ptr = HIDE_BACK_PTR(source);
}
}
GC_INNER void GC_marked_for_finalization(ptr_t dest)
{
GC_store_back_pointer(MARKED_FOR_FINALIZATION, dest);
}
/* Store information about the object referencing dest in *base_p */
/* and *offset_p. */
/* source is root ==> *base_p = address, *offset_p = 0 */
/* source is heap object ==> *base_p != 0, *offset_p = offset */
/* Returns 1 on success, 0 if source couldn't be determined. */
/* Dest can be any address within a heap object. */
GC_API GC_ref_kind GC_CALL GC_get_back_ptr_info(void *dest, void **base_p,
size_t *offset_p)
{
oh * hdr = (oh *)GC_base(dest);
ptr_t bp;
ptr_t bp_base;
# ifdef LINT2
/* Explicitly instruct the code analysis tool that */
/* GC_get_back_ptr_info is not expected to be called with an */
/* incorrect "dest" value. */
if (!hdr) ABORT("Invalid GC_get_back_ptr_info argument");
# endif
if (!GC_HAS_DEBUG_INFO((ptr_t) hdr)) return GC_NO_SPACE;
bp = GC_REVEAL_POINTER(hdr -> oh_back_ptr);
if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD;
if (MARKED_FROM_REGISTER == bp) return GC_REFD_FROM_REG;
if (NOT_MARKED == bp) return GC_UNREFERENCED;
# if ALIGNMENT == 1
/* Heuristically try to fix off by 1 errors we introduced by */
/* insisting on even addresses. */
{
ptr_t alternate_ptr = bp + 1;
ptr_t target = *(ptr_t *)bp;
ptr_t alternate_target = *(ptr_t *)alternate_ptr;
if ((word)alternate_target >= (word)GC_least_plausible_heap_addr
&& (word)alternate_target <= (word)GC_greatest_plausible_heap_addr
&& ((word)target < (word)GC_least_plausible_heap_addr
|| (word)target > (word)GC_greatest_plausible_heap_addr)) {
bp = alternate_ptr;
}
}
# endif
bp_base = GC_base(bp);
if (0 == bp_base) {
*base_p = bp;
*offset_p = 0;
return GC_REFD_FROM_ROOT;
} else {
if (GC_HAS_DEBUG_INFO(bp_base)) bp_base += sizeof(oh);
*base_p = bp_base;
*offset_p = bp - bp_base;
return GC_REFD_FROM_HEAP;
}
}
/* Generate a random heap address. */
/* The resulting address is in the heap, but */
/* not necessarily inside a valid object. */
GC_API void * GC_CALL GC_generate_random_heap_address(void)
{
size_t i;
size_t size;
word heap_offset = RANDOM();
if (GC_heapsize > RAND_MAX) {
heap_offset *= RAND_MAX;
heap_offset += RANDOM();
}
heap_offset %= GC_heapsize;
/* This doesn't yield a uniform distribution, especially if */
/* e.g. RAND_MAX = 1.5* GC_heapsize. But for typical cases, */
/* it's not too bad. */
for (i = 0;; ++i) {
if (i >= GC_n_heap_sects)
ABORT("GC_generate_random_heap_address: size inconsistency");
size = GC_heap_sects[i].hs_bytes;
if (heap_offset < size) {
break;
} else {
heap_offset -= size;
}
}
return GC_heap_sects[i].hs_start + heap_offset;
}
/* Generate a random address inside a valid marked heap object. */
GC_API void * GC_CALL GC_generate_random_valid_address(void)
{
ptr_t result;
ptr_t base;
do {
result = GC_generate_random_heap_address();
base = GC_base(result);
} while (base == 0 || !GC_is_marked(base));
return result;
}
/* Print back trace for p */
GC_API void GC_CALL GC_print_backtrace(void *p)
{
void *current = p;
int i;
GC_ref_kind source;
size_t offset;
void *base;
GC_print_heap_obj(GC_base(current));
for (i = 0; ; ++i) {
source = GC_get_back_ptr_info(current, &base, &offset);
if (GC_UNREFERENCED == source) {
GC_err_printf("Reference could not be found\n");
goto out;
}
if (GC_NO_SPACE == source) {
GC_err_printf("No debug info in object: Can't find reference\n");
goto out;
}
GC_err_printf("Reachable via %d levels of pointers from ", i);
switch(source) {
case GC_REFD_FROM_ROOT:
GC_err_printf("root at %p\n\n", base);
goto out;
case GC_REFD_FROM_REG:
GC_err_printf("root in register\n\n");
goto out;
case GC_FINALIZER_REFD:
GC_err_printf("list of finalizable objects\n\n");
goto out;
case GC_REFD_FROM_HEAP:
GC_err_printf("offset %ld in object:\n", (long)offset);
/* Take GC_base(base) to get real base, i.e. header. */
GC_print_heap_obj(GC_base(base));
break;
default:
GC_err_printf("INTERNAL ERROR: UNEXPECTED SOURCE!!!!\n");
goto out;
}
current = base;
}
out:;
}
/* Force a garbage collection and generate/print a backtrace */
/* from a random heap address. */
GC_INNER void GC_generate_random_backtrace_no_gc(void)
{
void * current;
current = GC_generate_random_valid_address();
GC_printf("\n****Chosen address %p in object\n", current);
GC_print_backtrace(current);
}
GC_API void GC_CALL GC_generate_random_backtrace(void)
{
if (GC_try_to_collect(GC_never_stop_func) == 0) {
GC_err_printf("Cannot generate a backtrace: "
"garbage collection is disabled!\n");
return;
}
GC_generate_random_backtrace_no_gc();
}
#endif /* KEEP_BACK_PTRS */
# define CROSSES_HBLK(p, sz) \
(((word)((p) + sizeof(oh) + (sz) - 1) ^ (word)(p)) >= HBLKSIZE)
/* Store debugging info into p. Return displaced pointer. */
/* This version assumes we do hold the allocation lock. */
STATIC ptr_t GC_store_debug_info_inner(ptr_t p, word sz GC_ATTR_UNUSED,
const char *string, int linenum)
{
word * result = (word *)((oh *)p + 1);
GC_ASSERT(GC_size(p) >= sizeof(oh) + sz);
GC_ASSERT(!(SMALL_OBJ(sz) && CROSSES_HBLK(p, sz)));
# ifdef KEEP_BACK_PTRS
((oh *)p) -> oh_back_ptr = HIDE_BACK_PTR(NOT_MARKED);
# endif
# ifdef MAKE_BACK_GRAPH
((oh *)p) -> oh_bg_ptr = HIDE_BACK_PTR((ptr_t)0);
# endif
((oh *)p) -> oh_string = string;
((oh *)p) -> oh_int = (word)linenum;
# ifndef SHORT_DBG_HDRS
((oh *)p) -> oh_sz = sz;
((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
result[SIMPLE_ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
# endif
return((ptr_t)result);
}
GC_INNER ptr_t GC_store_debug_info(ptr_t p, word sz, const char *string,
int linenum)
{
ptr_t result;
DCL_LOCK_STATE;
LOCK();
result = GC_store_debug_info_inner(p, sz, string, linenum);
UNLOCK();
return result;
}
#ifndef SHORT_DBG_HDRS
/* Check the object with debugging info at ohdr. */
/* Return NULL if it's OK. Else return clobbered */
/* address. */
STATIC ptr_t GC_check_annotated_obj(oh *ohdr)
{
ptr_t body = (ptr_t)(ohdr + 1);
word gc_sz = GC_size((ptr_t)ohdr);
if (ohdr -> oh_sz + DEBUG_BYTES > gc_sz) {
return((ptr_t)(&(ohdr -> oh_sz)));
}
if (ohdr -> oh_sf != (START_FLAG ^ (word)body)) {
return((ptr_t)(&(ohdr -> oh_sf)));
}
if (((word *)ohdr)[BYTES_TO_WORDS(gc_sz)-1] != (END_FLAG ^ (word)body)) {
return((ptr_t)((word *)ohdr + BYTES_TO_WORDS(gc_sz)-1));
}
if (((word *)body)[SIMPLE_ROUNDED_UP_WORDS(ohdr -> oh_sz)]
!= (END_FLAG ^ (word)body)) {
return((ptr_t)((word *)body + SIMPLE_ROUNDED_UP_WORDS(ohdr->oh_sz)));
}
return(0);
}
#endif /* !SHORT_DBG_HDRS */
STATIC GC_describe_type_fn GC_describe_type_fns[MAXOBJKINDS] = {0};
GC_API void GC_CALL GC_register_describe_type_fn(int kind,
GC_describe_type_fn fn)
{
GC_describe_type_fns[kind] = fn;
}
#define GET_OH_LINENUM(ohdr) ((int)(ohdr)->oh_int)
#ifndef SHORT_DBG_HDRS
# define IF_NOT_SHORTDBG_HDRS(x) x
# define COMMA_IFNOT_SHORTDBG_HDRS(x) /* comma */, x
#else
# define IF_NOT_SHORTDBG_HDRS(x) /* empty */
# define COMMA_IFNOT_SHORTDBG_HDRS(x) /* empty */
#endif
/* Print a human-readable description of the object to stderr. */
/* p points to somewhere inside an object with the debugging info. */
STATIC void GC_print_obj(ptr_t p)
{
oh * ohdr = (oh *)GC_base(p);
ptr_t q;
hdr * hhdr;
int kind;
char *kind_str;
char buffer[GC_TYPE_DESCR_LEN + 1];
GC_ASSERT(I_DONT_HOLD_LOCK());
# ifdef LINT2
if (!ohdr) ABORT("Invalid GC_print_obj argument");
# endif
q = (ptr_t)(ohdr + 1);
/* Print a type description for the object whose client-visible */
/* address is q. */
hhdr = GC_find_header(q);
kind = hhdr -> hb_obj_kind;
if (0 != GC_describe_type_fns[kind] && GC_is_marked(ohdr)) {
/* This should preclude free list objects except with */
/* thread-local allocation. */
buffer[GC_TYPE_DESCR_LEN] = 0;
(GC_describe_type_fns[kind])(q, buffer);
GC_ASSERT(buffer[GC_TYPE_DESCR_LEN] == 0);
kind_str = buffer;
} else {
switch(kind) {
case PTRFREE:
kind_str = "PTRFREE";
break;
case NORMAL:
kind_str = "NORMAL";
break;
case UNCOLLECTABLE:
kind_str = "UNCOLLECTABLE";
break;
# ifdef ATOMIC_UNCOLLECTABLE
case AUNCOLLECTABLE:
kind_str = "ATOMIC_UNCOLLECTABLE";
break;
# endif
case STUBBORN:
kind_str = "STUBBORN";
break;
default:
kind_str = NULL;
/* The alternative is to use snprintf(buffer) but it is */
/* not quite portable (see vsnprintf in misc.c). */
}
}
if (NULL != kind_str) {
GC_err_printf("%p (%s:%d," IF_NOT_SHORTDBG_HDRS(" sz=%lu,") " %s)\n",
(ptr_t)ohdr + sizeof(oh),
ohdr->oh_string, GET_OH_LINENUM(ohdr) /*, */
COMMA_IFNOT_SHORTDBG_HDRS((unsigned long)ohdr->oh_sz),
kind_str);
} else {
GC_err_printf("%p (%s:%d," IF_NOT_SHORTDBG_HDRS(" sz=%lu,")
" kind=%d descr=0x%lx)\n", (ptr_t)ohdr + sizeof(oh),
ohdr->oh_string, GET_OH_LINENUM(ohdr) /*, */
COMMA_IFNOT_SHORTDBG_HDRS((unsigned long)ohdr->oh_sz),
kind, (unsigned long)hhdr->hb_descr);
}
PRINT_CALL_CHAIN(ohdr);
}
STATIC void GC_debug_print_heap_obj_proc(ptr_t p)
{
GC_ASSERT(I_DONT_HOLD_LOCK());
if (GC_HAS_DEBUG_INFO(p)) {
GC_print_obj(p);
} else {
GC_default_print_heap_obj_proc(p);
}
}
#ifndef SHORT_DBG_HDRS
/* Use GC_err_printf and friends to print a description of the object */
/* whose client-visible address is p, and which was smashed at */
/* clobbered_addr. */
STATIC void GC_print_smashed_obj(const char *msg, ptr_t p,
ptr_t clobbered_addr)
{
oh * ohdr = (oh *)GC_base(p);
GC_ASSERT(I_DONT_HOLD_LOCK());
# ifdef LINT2
if (!ohdr) ABORT("Invalid GC_print_smashed_obj argument");
# endif
if ((word)clobbered_addr <= (word)(&ohdr->oh_sz)
|| ohdr -> oh_string == 0) {
GC_err_printf(
"%s %p in or near object at %p(<smashed>, appr. sz = %lu)\n",
msg, clobbered_addr, p,
(unsigned long)(GC_size((ptr_t)ohdr) - DEBUG_BYTES));
} else {
GC_err_printf("%s %p in or near object at %p (%s:%d, sz=%lu)\n",
msg, clobbered_addr, p,
(word)(ohdr -> oh_string) < HBLKSIZE ? "(smashed string)" :
ohdr -> oh_string[0] == '\0' ? "EMPTY(smashed?)" :
ohdr -> oh_string,
GET_OH_LINENUM(ohdr), (unsigned long)(ohdr -> oh_sz));
PRINT_CALL_CHAIN(ohdr);
}
}
#endif
#ifndef SHORT_DBG_HDRS
STATIC void GC_check_heap_proc (void);
STATIC void GC_print_all_smashed_proc (void);
#else
STATIC void GC_do_nothing(void) {}
#endif
STATIC void GC_start_debugging_inner(void)
{
GC_ASSERT(I_HOLD_LOCK());
# ifndef SHORT_DBG_HDRS
GC_check_heap = GC_check_heap_proc;
GC_print_all_smashed = GC_print_all_smashed_proc;
# else
GC_check_heap = GC_do_nothing;
GC_print_all_smashed = GC_do_nothing;
# endif
GC_print_heap_obj = GC_debug_print_heap_obj_proc;
GC_debugging_started = TRUE;
GC_register_displacement_inner((word)sizeof(oh));
}
GC_INNER void GC_start_debugging(void)
{
DCL_LOCK_STATE;
LOCK();
GC_start_debugging_inner();
UNLOCK();
}
size_t GC_debug_header_size = sizeof(oh);
GC_API void GC_CALL GC_debug_register_displacement(size_t offset)
{
DCL_LOCK_STATE;
LOCK();
GC_register_displacement_inner(offset);
GC_register_displacement_inner((word)sizeof(oh) + offset);
UNLOCK();
}
#ifdef GC_ADD_CALLER
# if defined(HAVE_DLADDR) && defined(GC_RETURN_ADDR_PARENT)
# include <dlfcn.h>
STATIC void GC_caller_func_offset(word ad, const char **symp, int *offp)
{
Dl_info caller;
if (ad && dladdr((void *)ad, &caller) && caller.dli_sname != NULL) {
*symp = caller.dli_sname;
*offp = (int)((char *)ad - (char *)caller.dli_saddr);
}
if (NULL == *symp) {
*symp = "unknown";
}
}
# else
# define GC_caller_func_offset(ad, symp, offp) (void)(*(symp) = "unknown")
# endif
#endif /* GC_ADD_CALLER */
GC_API void * GC_CALL GC_debug_malloc(size_t lb, GC_EXTRA_PARAMS)
{
void * result;
/* Note that according to malloc() specification, if size is 0 then */
/* malloc() returns either NULL, or a unique pointer value that can */
/* later be successfully passed to free(). We always do the latter. */
result = GC_malloc(lb + DEBUG_BYTES);
# ifdef GC_ADD_CALLER
if (s == NULL) {
GC_caller_func_offset(ra, &s, &i);
}
# endif
if (result == 0) {
GC_err_printf("GC_debug_malloc(%lu) returning NULL (%s:%d)\n",
(unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
GC_API void * GC_CALL GC_debug_malloc_ignore_off_page(size_t lb,
GC_EXTRA_PARAMS)
{
void * result = GC_malloc_ignore_off_page(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_ignore_off_page(%lu)"
" returning NULL (%s:%d)\n", (unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
GC_API void * GC_CALL GC_debug_malloc_atomic_ignore_off_page(size_t lb,
GC_EXTRA_PARAMS)
{
void * result = GC_malloc_atomic_ignore_off_page(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_atomic_ignore_off_page(%lu)"
" returning NULL (%s:%d)\n", (unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
#ifdef DBG_HDRS_ALL
/* An allocation function for internal use. Normally internally */
/* allocated objects do not have debug information. But in this */
/* case, we need to make sure that all objects have debug headers. */
/* We assume debugging was started in collector initialization, and */
/* we already hold the GC lock. */
GC_INNER void * GC_debug_generic_malloc_inner(size_t lb, int k)
{
void * result = GC_generic_malloc_inner(lb + DEBUG_BYTES, k);
if (result == 0) {
GC_err_printf("GC internal allocation (%lu bytes) returning NULL\n",
(unsigned long) lb);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging_inner();
}
ADD_CALL_CHAIN(result, GC_RETURN_ADDR);
return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", 0));
}
GC_INNER void * GC_debug_generic_malloc_inner_ignore_off_page(size_t lb,
int k)
{
void * result = GC_generic_malloc_inner_ignore_off_page(
lb + DEBUG_BYTES, k);
if (result == 0) {
GC_err_printf("GC internal allocation (%lu bytes) returning NULL\n",
(unsigned long) lb);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging_inner();
}
ADD_CALL_CHAIN(result, GC_RETURN_ADDR);
return (GC_store_debug_info_inner(result, (word)lb, "INTERNAL", 0));
}
#endif /* DBG_HDRS_ALL */
#ifdef STUBBORN_ALLOC
GC_API void * GC_CALL GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
{
void * result = GC_malloc_stubborn(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_stubborn(%lu)"
" returning NULL (%s:%d)\n", (unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
GC_API void GC_CALL GC_debug_change_stubborn(const void *p)
{
const void * q = GC_base_C(p);
hdr * hhdr;
if (q == 0) {
ABORT_ARG1("GC_debug_change_stubborn: bad arg", ": %p", p);
}
hhdr = HDR(q);
if (hhdr -> hb_obj_kind != STUBBORN) {
ABORT_ARG1("GC_debug_change_stubborn: arg not stubborn", ": %p", p);
}
GC_change_stubborn(q);
}
GC_API void GC_CALL GC_debug_end_stubborn_change(const void *p)
{
const void * q = GC_base_C(p);
hdr * hhdr;
if (q == 0) {
ABORT_ARG1("GC_debug_end_stubborn_change: bad arg", ": %p", p);
}
hhdr = HDR(q);
if (hhdr -> hb_obj_kind != STUBBORN) {
ABORT_ARG1("GC_debug_end_stubborn_change: arg not stubborn",
": %p", p);
}
GC_end_stubborn_change(q);
}
#else /* !STUBBORN_ALLOC */
GC_API void * GC_CALL GC_debug_malloc_stubborn(size_t lb, GC_EXTRA_PARAMS)
{
return GC_debug_malloc(lb, OPT_RA s, i);
}
GC_API void GC_CALL GC_debug_change_stubborn(
const void * p GC_ATTR_UNUSED) {}
GC_API void GC_CALL GC_debug_end_stubborn_change(
const void * p GC_ATTR_UNUSED) {}
#endif /* !STUBBORN_ALLOC */
GC_API void * GC_CALL GC_debug_malloc_atomic(size_t lb, GC_EXTRA_PARAMS)
{
void * result = GC_malloc_atomic(lb + DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_atomic(%lu) returning NULL (%s:%d)\n",
(unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
GC_API char * GC_CALL GC_debug_strdup(const char *str, GC_EXTRA_PARAMS)
{
char *copy;
size_t lb;
if (str == NULL) {
if (GC_find_leak)
GC_err_printf("strdup(NULL) behavior is undefined\n");
return NULL;
}
lb = strlen(str) + 1;
copy = GC_debug_malloc_atomic(lb, OPT_RA s, i);
if (copy == NULL) {
# ifndef MSWINCE
errno = ENOMEM;
# endif
return NULL;
}
BCOPY(str, copy, lb);
return copy;
}
GC_API char * GC_CALL GC_debug_strndup(const char *str, size_t size,
GC_EXTRA_PARAMS)
{
char *copy;
size_t len = strlen(str); /* str is expected to be non-NULL */
if (len > size)
len = size;
copy = GC_debug_malloc_atomic(len + 1, OPT_RA s, i);
if (copy == NULL) {
# ifndef MSWINCE
errno = ENOMEM;
# endif
return NULL;
}
BCOPY(str, copy, len);
copy[len] = '\0';
return copy;
}
#ifdef GC_REQUIRE_WCSDUP
# include <wchar.h> /* for wcslen() */
GC_API wchar_t * GC_CALL GC_debug_wcsdup(const wchar_t *str, GC_EXTRA_PARAMS)
{
size_t lb = (wcslen(str) + 1) * sizeof(wchar_t);
wchar_t *copy = GC_debug_malloc_atomic(lb, OPT_RA s, i);
if (copy == NULL) {
# ifndef MSWINCE
errno = ENOMEM;
# endif
return NULL;
}
BCOPY(str, copy, lb);
return copy;
}
#endif /* GC_REQUIRE_WCSDUP */
GC_API void * GC_CALL GC_debug_malloc_uncollectable(size_t lb,
GC_EXTRA_PARAMS)
{
void * result = GC_malloc_uncollectable(lb + UNCOLLECTABLE_DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_uncollectable(%lu)"
" returning NULL (%s:%d)\n", (unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
#ifdef ATOMIC_UNCOLLECTABLE
GC_API void * GC_CALL GC_debug_malloc_atomic_uncollectable(size_t lb,
GC_EXTRA_PARAMS)
{
void * result =
GC_malloc_atomic_uncollectable(lb + UNCOLLECTABLE_DEBUG_BYTES);
if (result == 0) {
GC_err_printf("GC_debug_malloc_atomic_uncollectable(%lu)"
" returning NULL (%s:%d)\n", (unsigned long)lb, s, i);
return(0);
}
if (!GC_debugging_started) {
GC_start_debugging();
}
ADD_CALL_CHAIN(result, ra);
return (GC_store_debug_info(result, (word)lb, s, i));
}
#endif /* ATOMIC_UNCOLLECTABLE */
#ifndef GC_FREED_MEM_MARKER
# if CPP_WORDSZ == 32
# define GC_FREED_MEM_MARKER 0xdeadbeef
# else
# define GC_FREED_MEM_MARKER GC_WORD_C(0xEFBEADDEdeadbeef)
# endif
#endif
GC_API void GC_CALL GC_debug_free(void * p)
{
ptr_t base;
if (0 == p) return;
base = GC_base(p);
if (base == 0) {
ABORT_ARG1("Invalid pointer passed to free()", ": %p", p);
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf(
"GC_debug_free called on pointer %p w/o debugging info\n", p);
} else {
# ifndef SHORT_DBG_HDRS
ptr_t clobbered = GC_check_annotated_obj((oh *)base);
word sz = GC_size(base);
if (clobbered != 0) {
GC_have_errors = TRUE;
if (((oh *)base) -> oh_sz == sz) {
GC_print_smashed_obj(
"GC_debug_free: found previously deallocated (?) object at",
p, clobbered);
return; /* ignore double free */
} else {
GC_print_smashed_obj("GC_debug_free: found smashed location at",
p, clobbered);
}
}
/* Invalidate size (mark the object as deallocated) */
((oh *)base) -> oh_sz = sz;
# endif /* SHORT_DBG_HDRS */
}
if (GC_find_leak
# ifndef SHORT_DBG_HDRS
&& ((ptr_t)p - (ptr_t)base != sizeof(oh) || !GC_findleak_delay_free)
# endif
) {
GC_free(base);
} else {
hdr * hhdr = HDR(p);
if (hhdr -> hb_obj_kind == UNCOLLECTABLE
# ifdef ATOMIC_UNCOLLECTABLE
|| hhdr -> hb_obj_kind == AUNCOLLECTABLE
# endif
) {
GC_free(base);
} else {
size_t i;
size_t obj_sz = BYTES_TO_WORDS(hhdr -> hb_sz - sizeof(oh));
for (i = 0; i < obj_sz; ++i)
((word *)p)[i] = GC_FREED_MEM_MARKER;
GC_ASSERT((word *)p + i == (word *)(base + hhdr -> hb_sz));
}
} /* !GC_find_leak */
}
#if defined(THREADS) && defined(DBG_HDRS_ALL)
/* Used internally; we assume it's called correctly. */
GC_INNER void GC_debug_free_inner(void * p)
{
ptr_t base = GC_base(p);
GC_ASSERT((ptr_t)p - (ptr_t)base == sizeof(oh));
# ifdef LINT2
if (!base) ABORT("Invalid GC_debug_free_inner argument");
# endif
# ifndef SHORT_DBG_HDRS
/* Invalidate size */
((oh *)base) -> oh_sz = GC_size(base);
# endif
GC_free_inner(base);
}
#endif
GC_API void * GC_CALL GC_debug_realloc(void * p, size_t lb, GC_EXTRA_PARAMS)
{
void * base;
void * result;
hdr * hhdr;
if (p == 0) {
return GC_debug_malloc(lb, OPT_RA s, i);
}
# ifdef GC_ADD_CALLER
if (s == NULL) {
GC_caller_func_offset(ra, &s, &i);
}
# endif
base = GC_base(p);
if (base == 0) {
ABORT_ARG1("Invalid pointer passed to realloc()", ": %p", p);
}
if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
GC_err_printf(
"GC_debug_realloc called on pointer %p w/o debugging info\n", p);
return(GC_realloc(p, lb));
}
hhdr = HDR(base);
switch (hhdr -> hb_obj_kind) {
# ifdef STUBBORN_ALLOC
case STUBBORN:
result = GC_debug_malloc_stubborn(lb, OPT_RA s, i);
break;
# endif
case NORMAL:
result = GC_debug_malloc(lb, OPT_RA s, i);
break;
case PTRFREE:
result = GC_debug_malloc_atomic(lb, OPT_RA s, i);
break;
case UNCOLLECTABLE:
result = GC_debug_malloc_uncollectable(lb, OPT_RA s, i);
break;
# ifdef ATOMIC_UNCOLLECTABLE
case AUNCOLLECTABLE:
result = GC_debug_malloc_atomic_uncollectable(lb, OPT_RA s, i);
break;
# endif
default:
result = NULL; /* initialized to prevent warning. */
ABORT_RET("GC_debug_realloc: encountered bad kind");
}
if (result != NULL) {
size_t old_sz;
# ifdef SHORT_DBG_HDRS
old_sz = GC_size(base) - sizeof(oh);
# else
old_sz = ((oh *)base) -> oh_sz;
# endif
BCOPY(p, result, old_sz < lb ? old_sz : lb);
GC_debug_free(p);
}
return(result);
}
#ifndef SHORT_DBG_HDRS
/* List of smashed (clobbered) locations. We defer printing these, */
/* since we can't always print them nicely with the allocation lock */
/* held. We put them here instead of in GC_arrays, since it may be */
/* useful to be able to look at them with the debugger. */
#ifndef MAX_SMASHED
# define MAX_SMASHED 20
#endif
STATIC ptr_t GC_smashed[MAX_SMASHED] = {0};
STATIC unsigned GC_n_smashed = 0;
STATIC void GC_add_smashed(ptr_t smashed)
{
GC_ASSERT(GC_is_marked(GC_base(smashed)));
/* FIXME: Prevent adding an object while printing smashed list. */
GC_smashed[GC_n_smashed] = smashed;
if (GC_n_smashed < MAX_SMASHED - 1) ++GC_n_smashed;
/* In case of overflow, we keep the first MAX_SMASHED-1 */
/* entries plus the last one. */
GC_have_errors = TRUE;
}
/* Print all objects on the list. Clear the list. */
STATIC void GC_print_all_smashed_proc(void)
{
unsigned i;
GC_ASSERT(I_DONT_HOLD_LOCK());
if (GC_n_smashed == 0) return;
GC_err_printf("GC_check_heap_block: found %u smashed heap objects:\n",
GC_n_smashed);
for (i = 0; i < GC_n_smashed; ++i) {
ptr_t base = (ptr_t)GC_base(GC_smashed[i]);
# ifdef LINT2
if (!base) ABORT("Invalid GC_smashed element");
# endif
GC_print_smashed_obj("", base + sizeof(oh), GC_smashed[i]);
GC_smashed[i] = 0;
}
GC_n_smashed = 0;
}
/* Check all marked objects in the given block for validity */
/* Avoid GC_apply_to_each_object for performance reasons. */
STATIC void GC_check_heap_block(struct hblk *hbp, word dummy GC_ATTR_UNUSED)
{
struct hblkhdr * hhdr = HDR(hbp);
size_t sz = hhdr -> hb_sz;
size_t bit_no;
char *p, *plim;
p = hbp->hb_body;
if (sz > MAXOBJBYTES) {
plim = p;
} else {
plim = hbp->hb_body + HBLKSIZE - sz;
}
/* go through all words in block */
for (bit_no = 0; (word)p <= (word)plim;
bit_no += MARK_BIT_OFFSET(sz), p += sz) {
if (mark_bit_from_hdr(hhdr, bit_no) && GC_HAS_DEBUG_INFO((ptr_t)p)) {
ptr_t clobbered = GC_check_annotated_obj((oh *)p);
if (clobbered != 0)
GC_add_smashed(clobbered);
}
}
}
/* This assumes that all accessible objects are marked, and that */
/* I hold the allocation lock. Normally called by collector. */
STATIC void GC_check_heap_proc(void)
{