forked from php/php-src
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathphpdbg_watch.c
1435 lines (1229 loc) · 53.1 KB
/
phpdbg_watch.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 (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Felipe Pena <[email protected]> |
| Authors: Joe Watkins <[email protected]> |
| Authors: Bob Weinand <[email protected]> |
+----------------------------------------------------------------------+
*/
/* Some information for the reader...
*
* The main structure managing the direct observations is the watchpoint (phpdbg_watchpoint_t). There are several types of watchpoints currently:
* WATCH_ON_BUCKET: a watchpoint on a Bucket element, used to monitor values inside HashTables (largely handled equivalently to WATCH_ON_ZVAL, it just monitors also for IS_UNDEF and key changes)
* WATCH_ON_ZVAL: a watchpoint on a bare zval (&zend_reference.val, zval.value.indirect)
* WATCH_ON_STR: a watchpoint on a zend_string (put on &ZSTR_LEN() in order to not watch refcount/hash)
* WATCH_ON_HASHTABLE: a watchpoint on a HashTable (currently only used to observe size changes, put after flags in order to not watch refcount)
* WATCH_ON_REFCOUNTED: a watchpoint on a zend_refcounted, observes the refcount and serves as reference pointer in the custom efree handler
* WATCH_ON_HASHDATA: special watchpoint to watch for HT_GET_DATA_ADDR(ht) being efree()'d to be able to properly relocate Bucket watches
*
* Watch elements are either simple, recursive or implicit (PHPDBG_WATCH_* flags)
* Simple means that a particular watchpoint was explicitly defined
* Recursive watch elements are created recursively (recursive root flag is to distinguish the root element easily from its children recursive elements)
* Implicit watch elements are implicitly created on all ancestors of simple or recursive watch elements
* Recursive and (simple or implicit) watch elements are mutually exclusive
* Array/Object to distinguish watch elements on arrays
*
* Watch elements all contain a reference to a watchpoint (except if scheduled for recreation); a "watch" is a watch element created by the user with a specific id
* Each watch has its independent structure of watch elements, watchpoints are responsible for managing collisions and preventing pointers being watched multiple times
*
* PHPDBG_G(watchpoint_tree) contains all watchpoints identified by the watch target address
* PHPDBG_G(watch_HashTables) contains the addresses of parent_containers of watch elements
* PHPDBG_G(watch_elements) contains all directly defined watch elements (i.e. those which have an individual id)
* PHPDBG_G(watch_collisions) is indexed by a zend_refcounted * pointer (phpdbg_watchpoint_t.ref). It stores information about collisions (everything which contains a zend_refcounted * may be referenced by multiple watches)
* PHPDBG_G(watch_free) is a set of pointers to watch for being freed (like HashTables referenced by phpdbg_watch_element.parent_container)
* PHPDBG_G(watch_recreation) is the list of watch elements whose watchpoint has been removed (via efree() for example) and needs to be recreated
* PHPDBG_G(watchlist_mem) is the list of unprotected memory pages; used to watch which pages need their PROT_WRITE attribute removed after checking
*
* Watching on addresses:
* * Address and size are transformed into memory page aligned address and size
* * mprotect() enables or disables them (depending on flags) - Windows has a transparent compatibility layer in phpdbg_win.c
* * segfault handler stores the address of the page and marks it again as writable
* * later watchpoints pointing inside these pages are compared against their current value and eventually reactivated (or deleted)
*
* Creating a watch:
* * Implicit watch elements for each element in the hierarchy (starting from base, which typically is current symbol table) except the last one
* * Create a watch element with either simple flag or recursive [+ root] flags
* * If the element has recursive flag, create elements recursively for every referenced HashTable and zval
*
* Creating a watch element:
* * For each watch element a related watchpoint is created, if there's none yet; add itself then into the list of parents of that watchpoint
* * If the watch has a parent_container, add itself also into a phpdbg_watch_ht_info (inside PHPDBG_G(watch_HashTables)) [and creates it if not yet existing]
*
* Creation of watchpoints:
* * Watchpoints create a watch collision for each refcounted or indirect on the zval (if type is WATCH_ON_BUCKET or WATCH_ON_ZVAL)
* * Backs the current value of the watched pointer up
* * Installs the watchpoint in PHPDBG_G(watchpoint_tree) and activates it (activation of a watchpoint = remove PROT_WRITE from the pages the watched pointer resides on)
*
* Watch collisions:
* * Manages a watchpoint on the refcount (WATCH_ON_REFCOUNTED) or indirect zval (WATCH_ON_ZVAL)
* * Guarantees that every pointer is watched at most once (by having a pointer to collision mapping in PHPDBG_G(watch_collisions), which have the unique watchpoints for the respective collision)
* * Contains a list of parents, i.e. which watchpoints reference it (via watch->ref)
* * If no watchpoint is referencing it anymore, the watch collision and its associated watchpoints (phpdbg_watch_collision.ref/reference) are removed
*
* Deleting a watch:
* * Watches are stored by an id in PHPDBG_G(watch_elements); the associated watch element is then deleted
* * Deletes all parent and children implicit watch elements
*
* Deleting a watch element:
* * Removes itself from the parent list of the associated watchpoints; if that parent list is empty, also delete the watchpoint
* * Removes itself from the related phpdbg_watch_ht_info if it has a parent_container
*
* Deleting a watchpoint:
* * Remove itself from watch collisions this watchpoint participates in
* * Removes the watchpoint from PHPDBG_G(watchpoint_tree) and deactivates it (deactivation of a watchpoint = add PROT_WRITE to the pages the watched pointer resides on)
*
* A watched pointer is efree()'d:
* * Needs immediate action as we else may run into dereferencing a pointer into freed memory
* * Deletes the associated watchpoint, and for each watch element, if recursive, all its children elements
* * If the its watch elements are implicit, recursive roots or simple, they and all their children are dissociated from their watchpoints (i.e. removed from the watchpoint, if no other element is referencing it, it is deleted); adds these elements to PHPDBG_G(watch_recreation)
*
* Recreating watchpoints:
* * Upon each opcode, PHPDBG_G(watch_recreation) is checked and all its elements are searched for whether the watch is still reachable via the tree given by its implicits
* * In case they are not reachable, the watch is deleted (and thus all the related watch elements), else a new watchpoint is created for all the watch elements
* * The old and new values of the watches are compared and shown if changed
*
* Comparing watchpoints:
* * The old and new values of the watches are compared and shown if changed
* * If changed, it is checked whether the refcounted/indirect changed and watch collisions removed or created accordingly
* * If a zval/bucket watchpoint is recursive, watch elements are added or removed accordingly
* * If an array watchpoint is recursive, new array watchpoints are added if there are new ones in the array
* * If the watch (element with an id) is not reachable anymore due to changes in implicits, the watch is removed
*/
#include "zend.h"
#include "phpdbg.h"
#include "phpdbg_btree.h"
#include "phpdbg_watch.h"
#include "phpdbg_utils.h"
#include "phpdbg_prompt.h"
#ifndef _WIN32
# include <unistd.h>
# include <sys/mman.h>
#endif
ZEND_EXTERN_MODULE_GLOBALS(phpdbg)
const phpdbg_command_t phpdbg_watch_commands[] = {
PHPDBG_COMMAND_D_EX(array, "create watchpoint on an array", 'a', watch_array, &phpdbg_prompt_commands[24], "s", 0),
PHPDBG_COMMAND_D_EX(delete, "delete watchpoint", 'd', watch_delete, &phpdbg_prompt_commands[24], "n", 0),
PHPDBG_COMMAND_D_EX(recursive, "create recursive watchpoints", 'r', watch_recursive, &phpdbg_prompt_commands[24], "s", 0),
PHPDBG_END_COMMAND
};
#define HT_FROM_ZVP(zvp) (Z_TYPE_P(zvp) == IS_OBJECT ? Z_OBJPROP_P(zvp) : Z_TYPE_P(zvp) == IS_ARRAY ? Z_ARRVAL_P(zvp) : NULL)
#define HT_WATCH_OFFSET (sizeof(zend_refcounted *) + sizeof(uint32_t)) /* we are not interested in gc and flags */
#define HT_PTR_HT(ptr) ((HashTable *) (((char *) (ptr)) - HT_WATCH_OFFSET))
#define HT_WATCH_HT(watch) HT_PTR_HT((watch)->addr.ptr)
/* ### PRINTING POINTER DIFFERENCES ### */
bool phpdbg_check_watch_diff(phpdbg_watchtype type, void *oldPtr, void *newPtr) {
switch (type) {
case WATCH_ON_BUCKET:
if (memcmp(&((Bucket *) oldPtr)->h, &((Bucket *) newPtr)->h, sizeof(Bucket) - sizeof(zval) /* key/val comparison */) != 0) {
return 2;
}
/* TODO: Is this intentional? */
ZEND_FALLTHROUGH;
case WATCH_ON_ZVAL:
return memcmp(oldPtr, newPtr, sizeof(zend_value) + sizeof(uint32_t) /* value + typeinfo */) != 0;
case WATCH_ON_HASHTABLE:
return zend_hash_num_elements(HT_PTR_HT(oldPtr)) != zend_hash_num_elements(HT_PTR_HT(newPtr));
case WATCH_ON_REFCOUNTED:
return memcmp(oldPtr, newPtr, sizeof(uint32_t) /* no zend_refcounted metadata info */) != 0;
case WATCH_ON_STR:
return memcmp(oldPtr, newPtr, *(size_t *) oldPtr + XtOffsetOf(zend_string, val) - XtOffsetOf(zend_string, len)) != 0;
case WATCH_ON_HASHDATA:
ZEND_UNREACHABLE();
}
return 0;
}
void phpdbg_print_watch_diff(phpdbg_watchtype type, zend_string *name, void *oldPtr, void *newPtr) {
int32_t elementDiff;
PHPDBG_G(watchpoint_hit) = 1;
phpdbg_notice("Breaking on watchpoint %.*s", (int) ZSTR_LEN(name), ZSTR_VAL(name));
switch (type) {
case WATCH_ON_BUCKET:
case WATCH_ON_ZVAL:
if (Z_REFCOUNTED_P((zval *) oldPtr)) {
phpdbg_writeln("Old value inaccessible or destroyed");
} else if (Z_TYPE_P((zval *) oldPtr) == IS_INDIRECT) {
phpdbg_writeln("Old value inaccessible or destroyed (was indirect)");
} else {
phpdbg_out("Old value: ");
zend_print_flat_zval_r((zval *) oldPtr);
phpdbg_out("\n");
}
while (Z_TYPE_P((zval *) newPtr) == IS_INDIRECT) {
newPtr = Z_INDIRECT_P((zval *) newPtr);
}
phpdbg_out("New value%s: ", Z_ISREF_P((zval *) newPtr) ? " (reference)" : "");
zend_print_flat_zval_r((zval *) newPtr);
phpdbg_out("\n");
break;
case WATCH_ON_HASHTABLE:
elementDiff = zend_hash_num_elements(HT_PTR_HT(oldPtr)) - zend_hash_num_elements(HT_PTR_HT(newPtr));
if (elementDiff > 0) {
phpdbg_writeln("%d elements were removed from the array", (int) elementDiff);
} else if (elementDiff < 0) {
phpdbg_writeln("%d elements were added to the array", (int) -elementDiff);
}
break;
case WATCH_ON_REFCOUNTED:
phpdbg_writeln("Old refcount: %d", GC_REFCOUNT((zend_refcounted *) oldPtr));
phpdbg_writeln("New refcount: %d", GC_REFCOUNT((zend_refcounted *) newPtr));
break;
case WATCH_ON_STR:
phpdbg_out("Old value: ");
zend_write((char *) oldPtr + XtOffsetOf(zend_string, val) - XtOffsetOf(zend_string, len), *(size_t *) oldPtr);
phpdbg_out("\n");
phpdbg_out("New value: ");
zend_write((char *) newPtr + XtOffsetOf(zend_string, val) - XtOffsetOf(zend_string, len), *(size_t *) newPtr);
phpdbg_out("\n");
break;
case WATCH_ON_HASHDATA:
ZEND_UNREACHABLE();
}
}
/* ### LOW LEVEL WATCHPOINT HANDLING ### */
static phpdbg_watchpoint_t *phpdbg_check_for_watchpoint(void *addr) {
phpdbg_watchpoint_t *watch;
phpdbg_btree_result *result = phpdbg_btree_find_closest(&PHPDBG_G(watchpoint_tree), (zend_ulong) phpdbg_get_page_boundary(addr) + phpdbg_pagesize - 1);
if (result == NULL) {
return NULL;
}
watch = result->ptr;
/* check if that addr is in a mprotect()'ed memory area */
if ((char *) phpdbg_get_page_boundary(watch->addr.ptr) > (char *) addr || (char *) phpdbg_get_page_boundary(watch->addr.ptr) + phpdbg_get_total_page_size(watch->addr.ptr, watch->size) < (char *) addr) {
/* failure */
return NULL;
}
return watch;
}
static void phpdbg_change_watchpoint_access(phpdbg_watchpoint_t *watch, int access) {
/* pagesize is assumed to be in the range of 2^x */
mprotect(phpdbg_get_page_boundary(watch->addr.ptr), phpdbg_get_total_page_size(watch->addr.ptr, watch->size), access);
}
static inline void phpdbg_activate_watchpoint(phpdbg_watchpoint_t *watch) {
phpdbg_change_watchpoint_access(watch, PROT_READ);
}
static inline void phpdbg_deactivate_watchpoint(phpdbg_watchpoint_t *watch) {
phpdbg_change_watchpoint_access(watch, PROT_READ | PROT_WRITE);
}
/* Note that consecutive pages need to be merged in order to avoid watchpoints spanning page boundaries to have part of their data in the one page, part in the other page */
#ifdef _WIN32
int phpdbg_watchpoint_segfault_handler(void *addr) {
#else
int phpdbg_watchpoint_segfault_handler(siginfo_t *info, void *context) {
#endif
void *page = phpdbg_get_page_boundary(
#ifdef _WIN32
addr
#else
info->si_addr
#endif
);
/* perhaps unnecessary, but check to be sure to not conflict with other segfault handlers */
if (phpdbg_check_for_watchpoint(page) == NULL) {
return FAILURE;
}
/* re-enable writing */
mprotect(page, phpdbg_pagesize, PROT_READ | PROT_WRITE);
zend_hash_index_add_empty_element(PHPDBG_G(watchlist_mem), (zend_ulong) page);
return SUCCESS;
}
/* ### REGISTER WATCHPOINT ### To be used only by watch element and collision managers ### */
static inline void phpdbg_store_watchpoint_btree(phpdbg_watchpoint_t *watch) {
phpdbg_btree_result *res;
ZEND_ASSERT((res = phpdbg_btree_find(&PHPDBG_G(watchpoint_tree), (zend_ulong) watch->addr.ptr)) == NULL || res->ptr == watch);
phpdbg_btree_insert(&PHPDBG_G(watchpoint_tree), (zend_ulong) watch->addr.ptr, watch);
}
static inline void phpdbg_remove_watchpoint_btree(phpdbg_watchpoint_t *watch) {
phpdbg_btree_delete(&PHPDBG_G(watchpoint_tree), (zend_ulong) watch->addr.ptr);
}
/* ### SET WATCHPOINT ADDR ### To be used only by watch element and collision managers ### */
void phpdbg_set_addr_watchpoint(void *addr, size_t size, phpdbg_watchpoint_t *watch) {
watch->addr.ptr = addr;
watch->size = size;
watch->ref = NULL;
watch->coll = NULL;
zend_hash_init(&watch->elements, 8, brml, NULL, 0);
}
void phpdbg_set_zval_watchpoint(zval *zv, phpdbg_watchpoint_t *watch) {
phpdbg_set_addr_watchpoint(zv, sizeof(zval) - sizeof(uint32_t), watch);
watch->type = WATCH_ON_ZVAL;
}
void phpdbg_set_bucket_watchpoint(Bucket *bucket, phpdbg_watchpoint_t *watch) {
phpdbg_set_addr_watchpoint(bucket, sizeof(Bucket), watch);
watch->type = WATCH_ON_BUCKET;
}
void phpdbg_set_ht_watchpoint(HashTable *ht, phpdbg_watchpoint_t *watch) {
phpdbg_set_addr_watchpoint(((char *) ht) + HT_WATCH_OFFSET, sizeof(HashTable) - HT_WATCH_OFFSET, watch);
watch->type = WATCH_ON_HASHTABLE;
}
void phpdbg_watch_backup_data(phpdbg_watchpoint_t *watch) {
switch (watch->type) {
case WATCH_ON_BUCKET:
case WATCH_ON_ZVAL:
case WATCH_ON_REFCOUNTED:
memcpy(&watch->backup, watch->addr.ptr, watch->size);
break;
case WATCH_ON_STR:
if (watch->backup.str) {
zend_string_release(watch->backup.str);
}
watch->backup.str = zend_string_init((char *) watch->addr.ptr + XtOffsetOf(zend_string, val) - XtOffsetOf(zend_string, len), *(size_t *) watch->addr.ptr, 1);
GC_MAKE_PERSISTENT_LOCAL(watch->backup.str);
break;
case WATCH_ON_HASHTABLE:
memcpy((char *) &watch->backup + HT_WATCH_OFFSET, watch->addr.ptr, watch->size);
case WATCH_ON_HASHDATA:
break;
}
}
/* ### MANAGE WATCH COLLISIONS ### To be used only by watch element manager and memory differ ### */
/* watch collisions are responsible for having only one watcher on a given refcounted/refval and having a mapping back to the parent zvals */
void phpdbg_delete_watch_collision(phpdbg_watchpoint_t *watch) {
phpdbg_watch_collision *coll;
if ((coll = zend_hash_index_find_ptr(&PHPDBG_G(watch_collisions), (zend_ulong) watch->ref))) {
zend_hash_index_del(&coll->parents, (zend_ulong) watch);
if (zend_hash_num_elements(&coll->parents) == 0) {
phpdbg_deactivate_watchpoint(&coll->ref);
phpdbg_remove_watchpoint_btree(&coll->ref);
if (coll->ref.type == WATCH_ON_ZVAL) {
phpdbg_delete_watch_collision(&coll->ref);
} else if (coll->reference.addr.ptr) {
phpdbg_deactivate_watchpoint(&coll->reference);
phpdbg_remove_watchpoint_btree(&coll->reference);
phpdbg_delete_watch_collision(&coll->reference);
if (coll->reference.type == WATCH_ON_STR) {
zend_string_release(coll->reference.backup.str);
}
}
zend_hash_index_del(&PHPDBG_G(watch_collisions), (zend_ulong) watch->ref);
zend_hash_destroy(&coll->parents);
efree(coll);
}
}
}
void phpdbg_update_watch_ref(phpdbg_watchpoint_t *watch) {
phpdbg_watch_collision *coll;
ZEND_ASSERT(watch->type == WATCH_ON_ZVAL || watch->type == WATCH_ON_BUCKET);
if (Z_REFCOUNTED_P(watch->addr.zv)) {
if (Z_COUNTED_P(watch->addr.zv) == watch->ref) {
return;
}
if (watch->ref != NULL) {
phpdbg_delete_watch_collision(watch);
}
watch->ref = Z_COUNTED_P(watch->addr.zv);
if (!(coll = zend_hash_index_find_ptr(&PHPDBG_G(watch_collisions), (zend_ulong) watch->ref))) {
coll = emalloc(sizeof(*coll));
coll->ref.type = WATCH_ON_REFCOUNTED;
phpdbg_set_addr_watchpoint(Z_COUNTED_P(watch->addr.zv), sizeof(uint32_t), &coll->ref);
coll->ref.coll = coll;
phpdbg_store_watchpoint_btree(&coll->ref);
phpdbg_activate_watchpoint(&coll->ref);
phpdbg_watch_backup_data(&coll->ref);
if (Z_ISREF_P(watch->addr.zv)) {
phpdbg_set_zval_watchpoint(Z_REFVAL_P(watch->addr.zv), &coll->reference);
coll->reference.coll = coll;
phpdbg_update_watch_ref(&coll->reference);
phpdbg_store_watchpoint_btree(&coll->reference);
phpdbg_activate_watchpoint(&coll->reference);
phpdbg_watch_backup_data(&coll->reference);
} else if (Z_TYPE_P(watch->addr.zv) == IS_STRING) {
coll->reference.type = WATCH_ON_STR;
phpdbg_set_addr_watchpoint(&Z_STRLEN_P(watch->addr.zv), XtOffsetOf(zend_string, val) - XtOffsetOf(zend_string, len) + Z_STRLEN_P(watch->addr.zv) + 1, &coll->reference);
coll->reference.coll = coll;
phpdbg_store_watchpoint_btree(&coll->reference);
phpdbg_activate_watchpoint(&coll->reference);
coll->reference.backup.str = NULL;
phpdbg_watch_backup_data(&coll->reference);
} else {
coll->reference.addr.ptr = NULL;
}
zend_hash_init(&coll->parents, 8, shitty stupid parameter, NULL, 0);
zend_hash_index_add_ptr(&PHPDBG_G(watch_collisions), (zend_ulong) watch->ref, coll);
}
zend_hash_index_add_ptr(&coll->parents, (zend_long) watch, watch);
} else if (Z_TYPE_P(watch->addr.zv) == IS_INDIRECT) {
if ((zend_refcounted *) Z_INDIRECT_P(watch->addr.zv) == watch->ref) {
return;
}
if (watch->ref != NULL) {
phpdbg_delete_watch_collision(watch);
}
watch->ref = (zend_refcounted *) Z_INDIRECT_P(watch->addr.zv);
if (!(coll = zend_hash_index_find_ptr(&PHPDBG_G(watch_collisions), (zend_ulong) watch->ref))) {
coll = emalloc(sizeof(*coll));
phpdbg_set_zval_watchpoint(Z_INDIRECT_P(watch->addr.zv), &coll->ref);
coll->ref.coll = coll;
phpdbg_update_watch_ref(&coll->ref);
phpdbg_store_watchpoint_btree(&coll->ref);
phpdbg_activate_watchpoint(&coll->ref);
phpdbg_watch_backup_data(&coll->ref);
zend_hash_init(&coll->parents, 8, shitty stupid parameter, NULL, 0);
zend_hash_index_add_ptr(&PHPDBG_G(watch_collisions), (zend_ulong) watch->ref, coll);
}
zend_hash_index_add_ptr(&coll->parents, (zend_long) watch, watch);
} else if (watch->ref) {
phpdbg_delete_watch_collision(watch);
watch->ref = NULL;
}
}
/* ### MANAGE WATCH ELEMENTS ### */
/* watchpoints must be unique per element. Only one watchpoint may point to one element. But many elements may point to one watchpoint. */
void phpdbg_recurse_watch_element(phpdbg_watch_element *element);
void phpdbg_remove_watch_element_recursively(phpdbg_watch_element *element);
void phpdbg_free_watch_element(phpdbg_watch_element *element);
void phpdbg_remove_watchpoint(phpdbg_watchpoint_t *watch);
void phpdbg_watch_parent_ht(phpdbg_watch_element *element);
phpdbg_watch_element *phpdbg_add_watch_element(phpdbg_watchpoint_t *watch, phpdbg_watch_element *element) {
phpdbg_btree_result *res;
if ((res = phpdbg_btree_find(&PHPDBG_G(watchpoint_tree), (zend_ulong) watch->addr.ptr)) == NULL) {
phpdbg_watchpoint_t *mem = emalloc(sizeof(*mem));
*mem = *watch;
watch = mem;
phpdbg_store_watchpoint_btree(watch);
if (watch->type == WATCH_ON_ZVAL || watch->type == WATCH_ON_BUCKET) {
phpdbg_update_watch_ref(watch);
}
phpdbg_activate_watchpoint(watch);
phpdbg_watch_backup_data(watch);
} else {
phpdbg_watch_element *old_element;
watch = res->ptr;
if ((old_element = zend_hash_find_ptr(&watch->elements, element->str))) {
phpdbg_free_watch_element(element);
return old_element;
}
}
element->watch = watch;
zend_hash_add_ptr(&watch->elements, element->str, element);
if (element->flags & PHPDBG_WATCH_RECURSIVE) {
phpdbg_recurse_watch_element(element);
}
return element;
}
phpdbg_watch_element *phpdbg_add_bucket_watch_element(Bucket *bucket, phpdbg_watch_element *element) {
phpdbg_watchpoint_t watch;
phpdbg_set_bucket_watchpoint(bucket, &watch);
element = phpdbg_add_watch_element(&watch, element);
phpdbg_watch_parent_ht(element);
return element;
}
phpdbg_watch_element *phpdbg_add_ht_watch_element(zval *zv, phpdbg_watch_element *element) {
phpdbg_watchpoint_t watch;
HashTable *ht = HT_FROM_ZVP(zv);
if (!ht) {
return NULL;
}
element->flags |= Z_TYPE_P(zv) == IS_ARRAY ? PHPDBG_WATCH_ARRAY : PHPDBG_WATCH_OBJECT;
phpdbg_set_ht_watchpoint(ht, &watch);
return phpdbg_add_watch_element(&watch, element);
}
bool phpdbg_is_recursively_watched(void *ptr, phpdbg_watch_element *element) {
phpdbg_watch_element *next = element;
do {
element = next;
if (element->watch->addr.ptr == ptr) {
return 1;
}
next = element->parent;
} while (!(element->flags & PHPDBG_WATCH_RECURSIVE_ROOT));
return 0;
}
void phpdbg_add_recursive_watch_from_ht(phpdbg_watch_element *element, zend_long idx, zend_string *str, zval *zv) {
phpdbg_watch_element *child;
if (phpdbg_is_recursively_watched(zv, element)) {
return;
}
child = emalloc(sizeof(*child));
child->flags = PHPDBG_WATCH_RECURSIVE;
if (str) {
child->str = strpprintf(0, (element->flags & PHPDBG_WATCH_ARRAY) ? "%.*s[%s]" : "%.*s->%s", (int) ZSTR_LEN(element->str) - 2, ZSTR_VAL(element->str), phpdbg_get_property_key(ZSTR_VAL(str)));
} else {
child->str = strpprintf(0, (element->flags & PHPDBG_WATCH_ARRAY) ? "%.*s[" ZEND_LONG_FMT "]" : "%.*s->" ZEND_LONG_FMT, (int) ZSTR_LEN(element->str) - 2, ZSTR_VAL(element->str), idx);
}
if (!str) {
str = zend_long_to_str(idx); // TODO: hack, use proper int handling for name in parent
} else { str = zend_string_copy(str); }
child->name_in_parent = str;
child->parent = element;
child->child = NULL;
child->parent_container = HT_WATCH_HT(element->watch);
zend_hash_add_ptr(&element->child_container, child->str, child);
phpdbg_add_bucket_watch_element((Bucket *) zv, child);
}
void phpdbg_recurse_watch_element(phpdbg_watch_element *element) {
phpdbg_watch_element *child;
zval *zv;
if (element->watch->type == WATCH_ON_ZVAL || element->watch->type == WATCH_ON_BUCKET) {
zv = element->watch->addr.zv;
while (Z_TYPE_P(zv) == IS_INDIRECT) {
zv = Z_INDIRECT_P(zv);
}
ZVAL_DEREF(zv);
if (element->child) {
phpdbg_remove_watch_element_recursively(element->child);
}
if ((Z_TYPE_P(zv) != IS_ARRAY && Z_TYPE_P(zv) != IS_OBJECT)
|| phpdbg_is_recursively_watched(HT_WATCH_OFFSET + (char *) HT_FROM_ZVP(zv), element)) {
if (element->child) {
phpdbg_free_watch_element(element->child);
element->child = NULL;
}
return;
}
if (element->child) {
child = element->child;
} else {
child = emalloc(sizeof(*child));
child->flags = PHPDBG_WATCH_RECURSIVE;
child->str = strpprintf(0, "%.*s[]", (int) ZSTR_LEN(element->str), ZSTR_VAL(element->str));
child->name_in_parent = NULL;
child->parent = element;
child->child = NULL;
element->child = child;
}
zend_hash_init(&child->child_container, 8, NULL, NULL, 0);
phpdbg_add_ht_watch_element(zv, child);
} else if (zend_hash_num_elements(&element->child_container) == 0) {
zend_string *str;
zend_long idx;
ZEND_ASSERT(element->watch->type == WATCH_ON_HASHTABLE);
ZEND_HASH_FOREACH_KEY_VAL(HT_WATCH_HT(element->watch), idx, str, zv) {
phpdbg_add_recursive_watch_from_ht(element, idx, str, zv);
} ZEND_HASH_FOREACH_END();
}
}
void phpdbg_watch_parent_ht(phpdbg_watch_element *element) {
if (element->watch->type == WATCH_ON_BUCKET) {
phpdbg_btree_result *res;
HashPosition pos;
phpdbg_watch_ht_info *hti;
ZEND_ASSERT(element->parent_container);
if (!(res = phpdbg_btree_find(&PHPDBG_G(watch_HashTables), (zend_ulong) element->parent_container))) {
hti = emalloc(sizeof(*hti));
hti->ht = element->parent_container;
zend_hash_init(&hti->watches, 0, grrrrr, ZVAL_PTR_DTOR, 0);
phpdbg_btree_insert(&PHPDBG_G(watch_HashTables), (zend_ulong) hti->ht, hti);
phpdbg_set_addr_watchpoint(HT_GET_DATA_ADDR(hti->ht), HT_HASH_SIZE(hti->ht->nTableMask), &hti->hash_watch);
hti->hash_watch.type = WATCH_ON_HASHDATA;
phpdbg_store_watchpoint_btree(&hti->hash_watch);
phpdbg_activate_watchpoint(&hti->hash_watch);
} else {
hti = (phpdbg_watch_ht_info *) res->ptr;
}
zend_hash_internal_pointer_end_ex(hti->ht, &pos);
hti->last = hti->ht->arData + pos;
hti->last_str = hti->last->key;
hti->last_idx = hti->last->h;
zend_hash_add_ptr(&hti->watches, element->name_in_parent, element);
}
}
void phpdbg_unwatch_parent_ht(phpdbg_watch_element *element) {
if (element->watch->type == WATCH_ON_BUCKET) {
phpdbg_btree_result *res = phpdbg_btree_find(&PHPDBG_G(watch_HashTables), (zend_ulong) element->parent_container);
ZEND_ASSERT(element->parent_container);
if (res) {
phpdbg_watch_ht_info *hti = res->ptr;
if (zend_hash_num_elements(&hti->watches) == 1) {
zend_hash_destroy(&hti->watches);
phpdbg_btree_delete(&PHPDBG_G(watch_HashTables), (zend_ulong) hti->ht);
phpdbg_deactivate_watchpoint(&hti->hash_watch);
phpdbg_remove_watchpoint_btree(&hti->hash_watch);
efree(hti);
} else {
zend_hash_del(&hti->watches, element->name_in_parent);
}
}
}
}
/* ### DE/QUEUE WATCH ELEMENTS ### to be used by watch element manager only */
/* implicit watchpoints may change (especially because of separation); elements updated by remove & re-add etc.; thus we need to wait a little bit (until next opcode) and then compare whether the watchpoint still exists and if not, remove it */
void phpdbg_dissociate_watch_element(phpdbg_watch_element *element, phpdbg_watch_element *until);
void phpdbg_free_watch_element_tree(phpdbg_watch_element *element);
void phpdbg_queue_element_for_recreation(phpdbg_watch_element *element) {
/* store lowermost element */
phpdbg_watch_element *prev;
if ((prev = zend_hash_find_ptr(&PHPDBG_G(watch_recreation), element->str))) {
phpdbg_watch_element *child = prev;
do {
if (child == element) {
return;
}
child = child->child;
} while (child);
}
zend_hash_update_ptr(&PHPDBG_G(watch_recreation), element->str, element);
/* dissociate from watchpoint to avoid dangling memory watches */
phpdbg_dissociate_watch_element(element, prev);
if (!element->parent) {
/* HERE BE DRAGONS; i.e. we assume HashTable is directly allocated via emalloc() ... (which *should be* the case for every user-accessible array and symbol tables) */
zend_hash_index_add_empty_element(&PHPDBG_G(watch_free), (zend_ulong) element->parent_container);
}
}
bool phpdbg_try_re_adding_watch_element(zval *parent, phpdbg_watch_element *element) {
zval *zv;
HashTable *ht = HT_FROM_ZVP(parent);
if (!ht) {
return 0;
} else if (element->flags & (PHPDBG_WATCH_ARRAY | PHPDBG_WATCH_OBJECT)) {
char *htPtr = ((char *) ht) + HT_WATCH_OFFSET;
char *oldPtr = ((char *) &element->backup.ht) + HT_WATCH_OFFSET;
if (phpdbg_check_watch_diff(WATCH_ON_HASHTABLE, oldPtr, htPtr)) {
phpdbg_print_watch_diff(WATCH_ON_HASHTABLE, element->str, oldPtr, htPtr);
}
phpdbg_add_ht_watch_element(parent, element);
} else if ((zv = zend_symtable_find(ht, element->name_in_parent))) {
if (element->flags & PHPDBG_WATCH_IMPLICIT) {
zval *next = zv;
while (Z_TYPE_P(next) == IS_INDIRECT) {
next = Z_INDIRECT_P(next);
}
if (Z_ISREF_P(next)) {
next = Z_REFVAL_P(next);
}
if (!phpdbg_try_re_adding_watch_element(next, element->child)) {
return 0;
}
} else if (phpdbg_check_watch_diff(WATCH_ON_ZVAL, &element->backup.zv, zv)) {
phpdbg_print_watch_diff(WATCH_ON_ZVAL, element->str, &element->backup.zv, zv);
}
element->parent_container = ht;
phpdbg_add_bucket_watch_element((Bucket *) zv, element);
phpdbg_watch_parent_ht(element);
} else {
return 0;
}
return 1;
}
void phpdbg_automatic_dequeue_free(phpdbg_watch_element *element) {
phpdbg_watch_element *child = element;
while (child->child && !(child->flags & PHPDBG_WATCH_RECURSIVE_ROOT)) {
child = child->child;
}
PHPDBG_G(watchpoint_hit) = 1;
if (zend_hash_index_del(&PHPDBG_G(watch_elements), child->id) == SUCCESS) {
phpdbg_notice("%.*s has been removed, removing watchpoint%s", (int) ZSTR_LEN(child->str), ZSTR_VAL(child->str), (child->flags & PHPDBG_WATCH_RECURSIVE_ROOT) ? " recursively" : "");
}
phpdbg_free_watch_element_tree(element);
}
void phpdbg_dequeue_elements_for_recreation(void) {
phpdbg_watch_element *element;
ZEND_HASH_FOREACH_PTR(&PHPDBG_G(watch_recreation), element) {
ZEND_ASSERT(element->flags & (PHPDBG_WATCH_IMPLICIT | PHPDBG_WATCH_RECURSIVE_ROOT | PHPDBG_WATCH_SIMPLE));
if (element->parent || zend_hash_index_find(&PHPDBG_G(watch_free), (zend_ulong) element->parent_container)) {
zval _zv, *zv = &_zv;
if (element->parent) {
ZEND_ASSERT(element->parent->watch->type == WATCH_ON_ZVAL || element->parent->watch->type == WATCH_ON_BUCKET);
zv = element->parent->watch->addr.zv;
while (Z_TYPE_P(zv) == IS_INDIRECT) {
zv = Z_INDIRECT_P(zv);
}
ZVAL_DEREF(zv);
} else {
ZVAL_ARR(zv, element->parent_container);
}
if (!phpdbg_try_re_adding_watch_element(zv, element)) {
phpdbg_automatic_dequeue_free(element);
}
} else {
phpdbg_automatic_dequeue_free(element);
}
} ZEND_HASH_FOREACH_END();
zend_hash_clean(&PHPDBG_G(watch_recreation));
zend_hash_clean(&PHPDBG_G(watch_free));
}
/* ### WATCH ELEMENT DELETION ### only use phpdbg_remove_watch_element from the exterior */
void phpdbg_clean_watch_element(phpdbg_watch_element *element);
void phpdbg_free_watch_element(phpdbg_watch_element *element) {
zend_string_release(element->str);
if (element->name_in_parent) {
zend_string_release(element->name_in_parent);
}
efree(element);
}
/* note: does *not* free the passed element, only clean */
void phpdbg_remove_watch_element_recursively(phpdbg_watch_element *element) {
if (element->child) {
phpdbg_remove_watch_element_recursively(element->child);
phpdbg_free_watch_element(element->child);
element->child = NULL;
} else if (element->flags & (PHPDBG_WATCH_ARRAY | PHPDBG_WATCH_OBJECT)) {
phpdbg_watch_element *child;
ZEND_HASH_FOREACH_PTR(&element->child_container, child) {
phpdbg_remove_watch_element_recursively(child);
phpdbg_free_watch_element(child);
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&element->child_container);
}
phpdbg_clean_watch_element(element);
}
/* remove single watch (i.e. manual unset) or implicit removed */
void phpdbg_remove_watch_element(phpdbg_watch_element *element) {
phpdbg_watch_element *parent = element->parent, *child = element->child;
while (parent) {
phpdbg_watch_element *cur = parent;
parent = parent->parent;
phpdbg_clean_watch_element(cur);
phpdbg_free_watch_element(cur);
}
while (child) {
phpdbg_watch_element *cur = child;
child = child->child;
if (cur->flags & PHPDBG_WATCH_RECURSIVE_ROOT) {
phpdbg_remove_watch_element_recursively(cur);
child = NULL;
} else {
phpdbg_clean_watch_element(cur);
}
phpdbg_free_watch_element(cur);
}
if (element->flags & PHPDBG_WATCH_RECURSIVE_ROOT) {
phpdbg_remove_watch_element_recursively(element);
} else {
phpdbg_clean_watch_element(element);
}
zend_hash_index_del(&PHPDBG_G(watch_elements), element->id);
phpdbg_free_watch_element(element);
}
void phpdbg_backup_watch_element(phpdbg_watch_element *element) {
memcpy(&element->backup, &element->watch->backup, /* element->watch->size */ sizeof(element->backup));
}
/* until argument to prevent double remove of children elements */
void phpdbg_dissociate_watch_element(phpdbg_watch_element *element, phpdbg_watch_element *until) {
phpdbg_watch_element *child = element;
ZEND_ASSERT((element->flags & (PHPDBG_WATCH_RECURSIVE_ROOT | PHPDBG_WATCH_RECURSIVE)) != PHPDBG_WATCH_RECURSIVE);
if (element->flags & PHPDBG_WATCH_RECURSIVE_ROOT) {
phpdbg_backup_watch_element(element);
phpdbg_remove_watch_element_recursively(element);
return;
}
while (child->child != until) {
child = child->child;
if (child->flags & PHPDBG_WATCH_RECURSIVE_ROOT) {
phpdbg_backup_watch_element(child);
phpdbg_remove_watch_element_recursively(child);
child->child = NULL;
break;
}
if (child->child == NULL || (child->flags & PHPDBG_WATCH_RECURSIVE_ROOT)) {
phpdbg_backup_watch_element(child);
}
phpdbg_clean_watch_element(child);
}
/* element needs to be removed last! */
if (element->child == NULL) {
phpdbg_backup_watch_element(element);
}
phpdbg_clean_watch_element(element);
}
/* unlike phpdbg_remove_watch_element this *only* frees and does not clean up element + children! Only use after previous cleanup (e.g. phpdbg_dissociate_watch_element) */
void phpdbg_free_watch_element_tree(phpdbg_watch_element *element) {
phpdbg_watch_element *parent = element->parent, *child = element->child;
while (parent) {
phpdbg_watch_element *cur = parent;
parent = parent->parent;
phpdbg_clean_watch_element(cur);
phpdbg_free_watch_element(cur);
}
while (child) {
phpdbg_watch_element *cur = child;
child = child->child;
phpdbg_free_watch_element(cur);
}
phpdbg_free_watch_element(element);
}
void phpdbg_update_watch_element_watch(phpdbg_watch_element *element) {
if (element->flags & PHPDBG_WATCH_IMPLICIT) {
phpdbg_watch_element *child = element->child;
while (child->flags & PHPDBG_WATCH_IMPLICIT) {
child = child->child;
}
ZEND_ASSERT(element->watch->type == WATCH_ON_ZVAL || element->watch->type == WATCH_ON_BUCKET);
phpdbg_queue_element_for_recreation(element);
} else if (element->flags & (PHPDBG_WATCH_RECURSIVE_ROOT | PHPDBG_WATCH_SIMPLE)) {
phpdbg_queue_element_for_recreation(element);
} else if (element->flags & PHPDBG_WATCH_RECURSIVE) {
phpdbg_remove_watch_element_recursively(element);
if (element->parent->flags & (PHPDBG_WATCH_OBJECT | PHPDBG_WATCH_ARRAY)) {
zend_hash_del(&element->parent->child_container, element->str);
} else {
element->parent->child = NULL;
}
phpdbg_free_watch_element(element);
}
}
void phpdbg_update_watch_collision_elements(phpdbg_watchpoint_t *watch) {
phpdbg_watchpoint_t *parent;
phpdbg_watch_element *element;
ZEND_HASH_FOREACH_PTR(&watch->coll->parents, parent) {
if (parent->coll) {
phpdbg_update_watch_collision_elements(parent);
} else {
ZEND_HASH_FOREACH_PTR(&parent->elements, element) {
phpdbg_update_watch_element_watch(element);
} ZEND_HASH_FOREACH_END();
}
} ZEND_HASH_FOREACH_END();
}
void phpdbg_remove_watchpoint(phpdbg_watchpoint_t *watch) {
phpdbg_watch_element *element;
phpdbg_deactivate_watchpoint(watch);
phpdbg_remove_watchpoint_btree(watch);
phpdbg_delete_watch_collision(watch);
if (watch->coll) {
phpdbg_update_watch_collision_elements(watch);
return;
}
watch->elements.nNumOfElements++; /* dirty hack to avoid double free */
ZEND_HASH_FOREACH_PTR(&watch->elements, element) {
phpdbg_update_watch_element_watch(element);
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&watch->elements);
efree(watch);
}
void phpdbg_clean_watch_element(phpdbg_watch_element *element) {
HashTable *elements = &element->watch->elements;
phpdbg_unwatch_parent_ht(element);
zend_hash_del(elements, element->str);
if (zend_hash_num_elements(elements) == 0) {
phpdbg_remove_watchpoint(element->watch);
}
}
/* TODO: compile a name of all hit watchpoints (ids ??) */
zend_string *phpdbg_watchpoint_change_collision_name(phpdbg_watchpoint_t *watch) {
phpdbg_watchpoint_t *parent;
phpdbg_watch_element *element;
zend_string *name = NULL;
if (watch->coll) {
ZEND_HASH_FOREACH_PTR(&watch->coll->parents, parent) {
if (name) {
zend_string_release(name);
}
name = phpdbg_watchpoint_change_collision_name(parent);
} ZEND_HASH_FOREACH_END();
return name;
}
ZEND_HASH_FOREACH_PTR(&watch->elements, element) {
if (element->flags & PHPDBG_WATCH_IMPLICIT) {
if ((watch->type == WATCH_ON_ZVAL || watch->type == WATCH_ON_BUCKET) && Z_TYPE(watch->backup.zv) > IS_STRING) {
phpdbg_update_watch_element_watch(element->child);
}
continue;
}
name = element->str;
} ZEND_HASH_FOREACH_END();
return name ? zend_string_copy(name) : NULL;
}
/* ### WATCHING FOR CHANGES ### */
/* TODO: enforce order: first parents, then children, in order to avoid false positives */
void phpdbg_check_watchpoint(phpdbg_watchpoint_t *watch) {
zend_string *name = NULL;
void *comparePtr;
if (watch->type == WATCH_ON_HASHTABLE) {
phpdbg_watch_element *element;
zend_string *str;
zend_long idx;
zval *zv;
ZEND_HASH_FOREACH_PTR(&watch->elements, element) {
if (element->flags & PHPDBG_WATCH_RECURSIVE) {
phpdbg_btree_result *res = phpdbg_btree_find(&PHPDBG_G(watch_HashTables), (zend_ulong) HT_WATCH_HT(watch));
phpdbg_watch_ht_info *hti = res ? res->ptr : NULL;
ZEND_HASH_REVERSE_FOREACH_KEY_VAL(HT_WATCH_HT(watch), idx, str, zv) {
if (!str) {
str = zend_long_to_str(idx); // TODO: hack, use proper int handling for name in parent
} else {
str = zend_string_copy(str);
}
if (hti && zend_hash_find(&hti->watches, str)) {
zend_string_release(str);
break;
}
ZEND_HASH_FOREACH_PTR(&watch->elements, element) {
if (element->flags & PHPDBG_WATCH_RECURSIVE) {
phpdbg_add_recursive_watch_from_ht(element, idx, str, zv);
}
} ZEND_HASH_FOREACH_END();
phpdbg_notice("Element %.*s has been added to watchpoint", (int) ZSTR_LEN(str), ZSTR_VAL(str));
zend_string_release(str);
PHPDBG_G(watchpoint_hit) = 1;
} ZEND_HASH_FOREACH_END();
break;
}
} ZEND_HASH_FOREACH_END();
}
if (watch->type == WATCH_ON_HASHDATA) {
return;
}
switch (watch->type) {
case WATCH_ON_STR:
comparePtr = &ZSTR_LEN(watch->backup.str);
break;
case WATCH_ON_HASHTABLE:
comparePtr = (char *) &watch->backup.ht + HT_WATCH_OFFSET;
break;
default:
comparePtr = &watch->backup;
}
if (!phpdbg_check_watch_diff(watch->type, comparePtr, watch->addr.ptr)) {
return;
}