2 * sgen-debug.c: Collector debugging
5 * Paolo Molaro (lupus@ximian.com)
6 * Rodrigo Kumpera (kumpera@gmail.com)
8 * Copyright 2005-2011 Novell, Inc (http://www.novell.com)
9 * Copyright 2011 Xamarin Inc (http://www.xamarin.com)
10 * Copyright 2011 Xamarin, Inc.
11 * Copyright (C) 2012 Xamarin Inc
13 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
21 #include "mono/sgen/sgen-gc.h"
22 #include "mono/sgen/sgen-cardtable.h"
23 #include "mono/sgen/sgen-protocol.h"
24 #include "mono/sgen/sgen-memory-governor.h"
25 #include "mono/sgen/sgen-pinning.h"
26 #include "mono/sgen/sgen-client.h"
28 #define LOAD_VTABLE SGEN_LOAD_VTABLE
30 #define object_is_forwarded SGEN_OBJECT_IS_FORWARDED
31 #define object_is_pinned SGEN_OBJECT_IS_PINNED
32 #define safe_object_get_size sgen_safe_object_get_size
34 void describe_ptr (char *ptr);
35 void check_object (GCObject *obj);
38 * ######################################################################
39 * ######## Collector debugging
40 * ######################################################################
43 static const char*descriptor_types [] = {
51 "complex pointer-free"
54 static char* describe_nursery_ptr (char *ptr, gboolean need_setup);
57 describe_pointer (char *ptr, gboolean need_setup)
67 if (sgen_ptr_in_nursery (ptr)) {
68 start = describe_nursery_ptr (ptr, need_setup);
72 vtable = LOAD_VTABLE ((GCObject*)ptr);
74 if (sgen_ptr_is_in_los (ptr, &start)) {
76 printf ("Pointer is the start of object %p in LOS space.\n", start);
78 printf ("Pointer is at offset 0x%x of object %p in LOS space.\n", (int)(ptr - start), start);
80 mono_sgen_los_describe_pointer (ptr);
81 vtable = LOAD_VTABLE ((GCObject*)ptr);
82 } else if (major_collector.ptr_is_in_non_pinned_space (ptr, &start)) {
84 printf ("Pointer is the start of object %p in oldspace.\n", start);
86 printf ("Pointer is at offset 0x%x of object %p in oldspace.\n", (int)(ptr - start), start);
88 printf ("Pointer inside oldspace.\n");
91 vtable = (GCVTable)major_collector.describe_pointer (ptr);
92 } else if (major_collector.ptr_is_from_pinned_alloc (ptr)) {
93 // FIXME: Handle pointers to the inside of objects
94 printf ("Pointer is inside a pinned chunk.\n");
95 vtable = LOAD_VTABLE ((GCObject*)ptr);
97 printf ("Pointer unknown.\n");
102 if (object_is_pinned (ptr))
103 printf ("Object is pinned.\n");
105 if ((forwarded = (char *)object_is_forwarded (ptr))) {
106 printf ("Object is forwarded to %p:\n", forwarded);
111 printf ("VTable: %p\n", vtable);
112 if (vtable == NULL) {
113 printf ("VTable is invalid (empty).\n");
116 if (sgen_ptr_in_nursery (vtable)) {
117 printf ("VTable is invalid (points inside nursery).\n");
120 printf ("Class: %s.%s\n", sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
122 desc = sgen_vtable_get_descriptor (vtable);
123 printf ("Descriptor: %lx\n", (long)desc);
125 type = desc & DESC_TYPE_MASK;
126 printf ("Descriptor type: %d (%s)\n", type, descriptor_types [type]);
128 size = sgen_safe_object_get_size ((GCObject*)ptr);
129 printf ("Size: %d\n", (int)size);
133 sgen_client_describe_invalid_pointer ((GCObject *) ptr);
137 describe_ptr (char *ptr)
139 describe_pointer (ptr, TRUE);
142 static gboolean missing_remsets;
145 * We let a missing remset slide if the target object is pinned,
146 * because the store might have happened but the remset not yet added,
147 * but in that case the target must be pinned. We might theoretically
148 * miss some missing remsets this way, but it's very unlikely.
151 #define HANDLE_PTR(ptr,obj) do { \
152 if (*(ptr) && sgen_ptr_in_nursery ((char*)*(ptr))) { \
153 if (!sgen_get_remset ()->find_address ((char*)(ptr)) && !sgen_cement_lookup (*(ptr))) { \
154 GCVTable __vt = SGEN_LOAD_VTABLE (obj); \
155 SGEN_LOG (0, "Oldspace->newspace reference %p at offset %zd in object %p (%s.%s) not found in remsets.", *(ptr), (char*)(ptr) - (char*)(obj), (obj), sgen_client_vtable_get_namespace (__vt), sgen_client_vtable_get_name (__vt)); \
156 binary_protocol_missing_remset ((obj), __vt, (int) ((char*)(ptr) - (char*)(obj)), *(ptr), (gpointer)LOAD_VTABLE(*(ptr)), object_is_pinned (*(ptr))); \
157 if (!object_is_pinned (*(ptr))) \
158 missing_remsets = TRUE; \
164 * Check that each object reference which points into the nursery can
165 * be found in the remembered sets.
168 check_consistency_callback (GCObject *obj, size_t size, void *dummy)
170 char *start = (char*)obj;
171 GCVTable vt = LOAD_VTABLE (obj);
172 SgenDescriptor desc = sgen_vtable_get_descriptor (vt);
173 SGEN_LOG (8, "Scanning object %p, vtable: %p (%s)", start, vt, sgen_client_vtable_get_name (vt));
175 #include "sgen-scan-object.h"
179 * Perform consistency check of the heap.
181 * Assumes the world is stopped.
184 sgen_check_consistency (void)
186 // Need to add more checks
188 missing_remsets = FALSE;
190 SGEN_LOG (1, "Begin heap consistency check...");
192 // Check that oldspace->newspace pointers are registered with the collector
193 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)check_consistency_callback, NULL);
195 sgen_los_iterate_objects ((IterateObjectCallbackFunc)check_consistency_callback, NULL);
197 SGEN_LOG (1, "Heap consistency check done.");
199 if (!binary_protocol_is_enabled ())
200 g_assert (!missing_remsets);
204 is_major_or_los_object_marked (GCObject *obj)
206 if (sgen_safe_object_get_size ((GCObject*)obj) > SGEN_MAX_SMALL_OBJ_SIZE) {
207 return sgen_los_object_is_pinned (obj);
209 return sgen_get_major_collector ()->is_object_live (obj);
214 #define HANDLE_PTR(ptr,obj) do { \
215 if (*(ptr) && !sgen_ptr_in_nursery ((char*)*(ptr)) && !is_major_or_los_object_marked ((GCObject*)*(ptr))) { \
216 if (!sgen_get_remset ()->find_address_with_cards (start, cards, (char*)(ptr))) { \
217 GCVTable __vt = SGEN_LOAD_VTABLE (obj); \
218 SGEN_LOG (0, "major->major reference %p at offset %zd in object %p (%s.%s) not found in remsets.", *(ptr), (char*)(ptr) - (char*)(obj), (obj), sgen_client_vtable_get_namespace (__vt), sgen_client_vtable_get_name (__vt)); \
219 binary_protocol_missing_remset ((obj), __vt, (int) ((char*)(ptr) - (char*)(obj)), *(ptr), (gpointer)LOAD_VTABLE(*(ptr)), object_is_pinned (*(ptr))); \
220 missing_remsets = TRUE; \
226 check_mod_union_callback (GCObject *obj, size_t size, void *dummy)
228 char *start = (char*)obj;
229 gboolean in_los = (gboolean) (size_t) dummy;
230 GCVTable vt = LOAD_VTABLE (obj);
231 SgenDescriptor desc = sgen_vtable_get_descriptor (vt);
233 SGEN_LOG (8, "Scanning object %p, vtable: %p (%s)", obj, vt, sgen_client_vtable_get_name (vt));
235 if (!is_major_or_los_object_marked (obj))
239 cards = sgen_los_header_for_object (obj)->cardtable_mod_union;
241 cards = sgen_get_major_collector ()->get_cardtable_mod_union_for_reference (start);
243 SGEN_ASSERT (0, cards, "we must have mod union for marked major objects");
245 #include "sgen-scan-object.h"
249 sgen_check_mod_union_consistency (void)
251 missing_remsets = FALSE;
253 major_collector.iterate_objects (ITERATE_OBJECTS_ALL, (IterateObjectCallbackFunc)check_mod_union_callback, (void*)FALSE);
255 sgen_los_iterate_objects ((IterateObjectCallbackFunc)check_mod_union_callback, (void*)TRUE);
257 if (!binary_protocol_is_enabled ())
258 g_assert (!missing_remsets);
262 #define HANDLE_PTR(ptr,obj) do { \
263 if (*(ptr) && !LOAD_VTABLE (*(ptr))) \
264 g_error ("Could not load vtable for obj %p slot %zd (size %zd)", obj, (char*)ptr - (char*)obj, (size_t)safe_object_get_size ((GCObject*)obj)); \
268 check_major_refs_callback (GCObject *obj, size_t size, void *dummy)
270 char *start = (char*)obj;
271 SgenDescriptor desc = sgen_obj_get_descriptor (obj);
273 #include "sgen-scan-object.h"
277 sgen_check_major_refs (void)
279 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)check_major_refs_callback, NULL);
280 sgen_los_iterate_objects ((IterateObjectCallbackFunc)check_major_refs_callback, NULL);
283 /* Check that the reference is valid */
285 #define HANDLE_PTR(ptr,obj) do { \
287 g_assert (sgen_client_vtable_get_namespace (SGEN_LOAD_VTABLE_UNCHECKED (*(ptr)))); \
294 * Perform consistency check on an object. Currently we only check that the
295 * reference fields are valid.
298 check_object (GCObject *obj)
300 char *start = (char*)obj;
306 desc = sgen_obj_get_descriptor (obj);
308 #include "sgen-scan-object.h"
312 static GCObject **valid_nursery_objects;
313 static int valid_nursery_object_count;
314 static gboolean broken_heap;
317 setup_mono_sgen_scan_area_with_callback (GCObject *object, size_t size, void *data)
319 valid_nursery_objects [valid_nursery_object_count++] = object;
323 setup_valid_nursery_objects (void)
325 if (!valid_nursery_objects)
326 valid_nursery_objects = (GCObject **)sgen_alloc_os_memory (DEFAULT_NURSERY_SIZE, (SgenAllocFlags)(SGEN_ALLOC_INTERNAL | SGEN_ALLOC_ACTIVATE), "debugging data");
327 valid_nursery_object_count = 0;
328 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, setup_mono_sgen_scan_area_with_callback, NULL, FALSE, FALSE);
332 find_object_in_nursery_dump (char *object)
334 int first = 0, last = valid_nursery_object_count;
335 while (first < last) {
336 int middle = first + ((last - first) >> 1);
337 if (object == (char*)valid_nursery_objects [middle])
340 if (object < (char*)valid_nursery_objects [middle])
345 g_assert (first == last);
350 iterate_valid_nursery_objects (IterateObjectCallbackFunc callback, void *data)
353 for (i = 0; i < valid_nursery_object_count; ++i) {
354 GCObject *obj = valid_nursery_objects [i];
355 callback (obj, safe_object_get_size (obj), data);
360 describe_nursery_ptr (char *ptr, gboolean need_setup)
365 setup_valid_nursery_objects ();
367 for (i = 0; i < valid_nursery_object_count - 1; ++i) {
368 if ((char*)valid_nursery_objects [i + 1] > ptr)
372 if (i >= valid_nursery_object_count || (char*)valid_nursery_objects [i] + safe_object_get_size (valid_nursery_objects [i]) < ptr) {
373 SGEN_LOG (0, "nursery-ptr (unalloc'd-memory)");
376 GCObject *obj = valid_nursery_objects [i];
377 if ((char*)obj == ptr)
378 SGEN_LOG (0, "nursery-ptr %p", obj);
380 SGEN_LOG (0, "nursery-ptr %p (interior-ptr offset %zd)", obj, ptr - (char*)obj);
386 is_valid_object_pointer (char *object)
388 if (sgen_ptr_in_nursery (object))
389 return find_object_in_nursery_dump (object);
391 if (sgen_los_is_valid_object (object))
394 if (major_collector.is_valid_object (object))
400 bad_pointer_spew (char *obj, char **slot)
403 GCVTable vtable = LOAD_VTABLE ((GCObject*)obj);
405 SGEN_LOG (0, "Invalid object pointer %p at offset %zd in object %p (%s.%s):", ptr,
407 obj, sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
408 describe_pointer (ptr, FALSE);
413 missing_remset_spew (char *obj, char **slot)
416 GCVTable vtable = LOAD_VTABLE ((GCObject*)obj);
418 SGEN_LOG (0, "Oldspace->newspace reference %p at offset %zd in object %p (%s.%s) not found in remsets.",
419 ptr, (char*)slot - obj, obj,
420 sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
426 FIXME Flag missing remsets due to pinning as non fatal
429 #define HANDLE_PTR(ptr,obj) do { \
430 if (*(char**)ptr) { \
431 if (!is_valid_object_pointer (*(char**)ptr)) { \
432 bad_pointer_spew ((char*)obj, (char**)ptr); \
433 } else if (!sgen_ptr_in_nursery (obj) && sgen_ptr_in_nursery ((char*)*ptr)) { \
434 if (!sgen_get_remset ()->find_address ((char*)(ptr)) && !sgen_cement_lookup (*(ptr)) && (!allow_missing_pinned || !SGEN_OBJECT_IS_PINNED (*(ptr)))) \
435 missing_remset_spew ((char*)obj, (char**)ptr); \
441 verify_object_pointers_callback (GCObject *obj, size_t size, void *data)
443 char *start = (char*)obj;
444 gboolean allow_missing_pinned = (gboolean) (size_t) data;
445 SgenDescriptor desc = sgen_obj_get_descriptor (obj);
447 #include "sgen-scan-object.h"
452 -This heap checker is racy regarding inlined write barriers and other JIT tricks that
453 depend on OP_DUMMY_USE.
456 sgen_check_whole_heap (gboolean allow_missing_pinned)
458 setup_valid_nursery_objects ();
461 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, verify_object_pointers_callback, (void*) (size_t) allow_missing_pinned, FALSE, TRUE);
462 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, verify_object_pointers_callback, (void*) (size_t) allow_missing_pinned);
463 sgen_los_iterate_objects (verify_object_pointers_callback, (void*) (size_t) allow_missing_pinned);
465 g_assert (!broken_heap);
469 ptr_in_heap (char *object)
471 if (sgen_ptr_in_nursery (object))
474 if (sgen_los_is_valid_object (object))
477 if (major_collector.is_valid_object (object))
484 * Do consistency checks on the object reference OBJ. Assert on failure.
487 sgen_check_objref (char *obj)
489 g_assert (ptr_in_heap (obj));
493 find_pinning_ref_from_thread (char *obj, size_t size)
495 #ifndef SGEN_WITHOUT_MONO
496 char *endobj = obj + size;
498 FOREACH_THREAD (info) {
499 mword *ctxstart, *ctxcurrent, *ctxend;
500 char **start = (char**)info->client_info.stack_start;
501 if (info->client_info.skip || info->client_info.gc_disabled)
503 while (start < (char**)info->client_info.stack_end) {
504 if (*start >= obj && *start < endobj)
505 SGEN_LOG (0, "Object %p referenced in thread %p (id %p) at %p, stack: %p-%p", obj, info, (gpointer)mono_thread_info_get_tid (info), start, info->client_info.stack_start, info->client_info.stack_end);
509 for (ctxstart = ctxcurrent = (mword*) &info->client_info.ctx, ctxend = (mword*) (&info->client_info.ctx + 1); ctxcurrent < ctxend; ctxcurrent ++) {
510 mword w = *ctxcurrent;
512 if (w >= (mword)obj && w < (mword)obj + size)
513 SGEN_LOG (0, "Object %p referenced in saved reg %d of thread %p (id %p)", obj, (int) (ctxcurrent - ctxstart), info, (gpointer)mono_thread_info_get_tid (info));
520 * Debugging function: find in the conservative roots where @obj is being pinned.
522 static G_GNUC_UNUSED void
523 find_pinning_reference (char *obj, size_t size)
527 char *endobj = obj + size;
529 SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_NORMAL], char **, start, RootRecord *, root) {
530 /* if desc is non-null it has precise info */
531 if (!root->root_desc) {
532 while (start < (char**)root->end_root) {
533 if (*start >= obj && *start < endobj) {
534 SGEN_LOG (0, "Object %p referenced in pinned roots %p-%p\n", obj, start, root->end_root);
539 } SGEN_HASH_TABLE_FOREACH_END;
541 find_pinning_ref_from_thread (obj, size);
545 #define HANDLE_PTR(ptr,obj) do { \
546 char* __target = *(char**)ptr; \
548 if (sgen_ptr_in_nursery (__target)) { \
549 g_assert (!SGEN_OBJECT_IS_FORWARDED (__target)); \
551 mword __size = sgen_safe_object_get_size ((GCObject*)__target); \
552 if (__size <= SGEN_MAX_SMALL_OBJ_SIZE) \
553 g_assert (major_collector.is_object_live ((GCObject*)__target)); \
555 g_assert (sgen_los_object_is_pinned ((GCObject*)__target)); \
561 check_marked_callback (GCObject *obj, size_t size, void *dummy)
563 char *start = (char*)obj;
564 gboolean flag = (gboolean) (size_t) dummy;
567 if (sgen_ptr_in_nursery (start)) {
569 SGEN_ASSERT (0, SGEN_OBJECT_IS_PINNED (obj), "All objects remaining in the nursery must be pinned");
571 if (!sgen_los_object_is_pinned (obj))
574 if (!major_collector.is_object_live (obj))
578 desc = sgen_obj_get_descriptor_safe (obj);
580 #include "sgen-scan-object.h"
584 sgen_check_heap_marked (gboolean nursery_must_be_pinned)
586 setup_valid_nursery_objects ();
588 iterate_valid_nursery_objects (check_marked_callback, (void*)(size_t)nursery_must_be_pinned);
589 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, check_marked_callback, (void*)FALSE);
590 sgen_los_iterate_objects (check_marked_callback, (void*)TRUE);
594 check_nursery_objects_pinned_callback (char *obj, size_t size, void *data /* ScanCopyContext *ctx */)
596 gboolean pinned = (gboolean) (size_t) data;
598 g_assert (!SGEN_OBJECT_IS_FORWARDED (obj));
600 g_assert (SGEN_OBJECT_IS_PINNED (obj));
602 g_assert (!SGEN_OBJECT_IS_PINNED (obj));
606 sgen_check_nursery_objects_pinned (gboolean pinned)
608 sgen_clear_nursery_fragments ();
609 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
610 (IterateObjectCallbackFunc)check_nursery_objects_pinned_callback, (void*) (size_t) pinned /* (void*)&ctx */, FALSE, TRUE);
614 verify_scan_starts (char *start, char *end)
618 for (i = 0; i < nursery_section->num_scan_start; ++i) {
619 char *addr = nursery_section->scan_starts [i];
620 if (addr > start && addr < end)
621 SGEN_LOG (0, "NFC-BAD SCAN START [%zu] %p for obj [%p %p]", i, addr, start, end);
626 sgen_debug_verify_nursery (gboolean do_dump_nursery_content)
628 char *start, *end, *cur, *hole_start;
630 if (nursery_canaries_enabled ())
631 SGEN_LOG (0, "Checking nursery canaries...");
633 /*This cleans up unused fragments */
634 sgen_nursery_allocator_prepare_for_pinning ();
636 hole_start = start = cur = sgen_get_nursery_start ();
637 end = sgen_get_nursery_end ();
641 gboolean is_array_fill;
644 cur += sizeof (void*);
648 if (object_is_forwarded (cur))
649 SGEN_LOG (0, "FORWARDED OBJ %p", cur);
650 else if (object_is_pinned (cur))
651 SGEN_LOG (0, "PINNED OBJ %p", cur);
653 ss = safe_object_get_size ((GCObject*)cur);
654 size = SGEN_ALIGN_UP (ss);
655 verify_scan_starts (cur, cur + size);
656 is_array_fill = sgen_client_object_is_array_fill ((GCObject*)cur);
657 if (do_dump_nursery_content) {
658 GCVTable vtable = SGEN_LOAD_VTABLE ((GCObject*)cur);
659 if (cur > hole_start)
660 SGEN_LOG (0, "HOLE [%p %p %d]", hole_start, cur, (int)(cur - hole_start));
661 SGEN_LOG (0, "OBJ [%p %p %d %d %s.%s %d]", cur, cur + size, (int)size, (int)ss,
662 sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable),
665 if (nursery_canaries_enabled () && !is_array_fill) {
666 CHECK_CANARY_FOR_OBJECT ((GCObject*)cur, TRUE);
667 CANARIFY_SIZE (size);
675 * Checks that no objects in the nursery are fowarded or pinned. This
676 * is a precondition to restarting the mutator while doing a
677 * concurrent collection. Note that we don't clear fragments because
678 * we depend on that having happened earlier.
681 sgen_debug_check_nursery_is_clean (void)
685 cur = sgen_get_nursery_start ();
686 end = sgen_get_nursery_end ();
692 cur += sizeof (void*);
696 g_assert (!object_is_forwarded (cur));
697 g_assert (!object_is_pinned (cur));
699 size = SGEN_ALIGN_UP (safe_object_get_size ((GCObject*)cur));
700 verify_scan_starts (cur, cur + size);
706 static gboolean scan_object_for_specific_ref_precise = TRUE;
709 #define HANDLE_PTR(ptr,obj) do { \
710 if ((GCObject*)*(ptr) == key) { \
711 GCVTable vtable = SGEN_LOAD_VTABLE (*(ptr)); \
712 g_print ("found ref to %p in object %p (%s.%s) at offset %zd\n", \
713 key, (obj), sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable), ((char*)(ptr) - (char*)(obj))); \
718 scan_object_for_specific_ref (GCObject *obj, GCObject *key)
722 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj)))
725 if (scan_object_for_specific_ref_precise) {
726 char *start = (char*)obj;
727 SgenDescriptor desc = sgen_obj_get_descriptor_safe (obj);
728 #include "sgen-scan-object.h"
730 mword *words = (mword*)obj;
731 size_t size = safe_object_get_size (obj);
733 for (i = 0; i < size / sizeof (mword); ++i) {
734 if (words [i] == (mword)key) {
735 GCVTable vtable = SGEN_LOAD_VTABLE (obj);
736 g_print ("found possible ref to %p in object %p (%s.%s) at offset %zd\n",
737 key, obj, sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable), i * sizeof (mword));
744 scan_object_for_specific_ref_callback (GCObject *obj, size_t size, GCObject *key)
746 scan_object_for_specific_ref (obj, key);
750 check_root_obj_specific_ref (RootRecord *root, GCObject *key, GCObject *obj)
754 g_print ("found ref to %p in root record %p\n", key, root);
757 static GCObject *check_key = NULL;
758 static RootRecord *check_root = NULL;
761 check_root_obj_specific_ref_from_marker (GCObject **obj, void *gc_data)
763 check_root_obj_specific_ref (check_root, check_key, *obj);
767 scan_roots_for_specific_ref (GCObject *key, int root_type)
773 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
774 SgenDescriptor desc = root->root_desc;
778 switch (desc & ROOT_DESC_TYPE_MASK) {
779 case ROOT_DESC_BITMAP:
780 desc >>= ROOT_DESC_TYPE_SHIFT;
783 check_root_obj_specific_ref (root, key, (GCObject *)*start_root);
788 case ROOT_DESC_COMPLEX: {
789 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
790 int bwords = (int) ((*bitmap_data) - 1);
791 void **start_run = start_root;
793 while (bwords-- > 0) {
794 gsize bmap = *bitmap_data++;
795 void **objptr = start_run;
798 check_root_obj_specific_ref (root, key, (GCObject *)*objptr);
802 start_run += GC_BITS_PER_WORD;
806 case ROOT_DESC_USER: {
807 SgenUserRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
808 marker (start_root, check_root_obj_specific_ref_from_marker, NULL);
811 case ROOT_DESC_RUN_LEN:
812 g_assert_not_reached ();
814 g_assert_not_reached ();
816 } SGEN_HASH_TABLE_FOREACH_END;
823 mono_gc_scan_for_specific_ref (GCObject *key, gboolean precise)
828 scan_object_for_specific_ref_precise = precise;
830 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
831 (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key, TRUE, FALSE);
833 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
835 sgen_los_iterate_objects ((IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
837 scan_roots_for_specific_ref (key, ROOT_TYPE_NORMAL);
838 scan_roots_for_specific_ref (key, ROOT_TYPE_WBARRIER);
840 SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_PINNED], void **, ptr, RootRecord *, root) {
841 while (ptr < (void**)root->end_root) {
842 check_root_obj_specific_ref (root, (GCObject *)*ptr, key);
845 } SGEN_HASH_TABLE_FOREACH_END;
847 if (sgen_is_world_stopped ())
848 find_pinning_ref_from_thread ((char*)key, sizeof (GCObject));
851 #ifndef SGEN_WITHOUT_MONO
853 static MonoDomain *check_domain = NULL;
856 check_obj_not_in_domain (MonoObject **o)
858 g_assert (((*o))->vtable->domain != check_domain);
863 check_obj_not_in_domain_callback (GCObject **o, void *gc_data)
865 g_assert ((*o)->vtable->domain != check_domain);
869 sgen_scan_for_registered_roots_in_domain (MonoDomain *domain, int root_type)
873 check_domain = domain;
874 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
875 SgenDescriptor desc = root->root_desc;
877 /* The MonoDomain struct is allowed to hold
878 references to objects in its own domain. */
879 if (start_root == (void**)domain)
882 switch (desc & ROOT_DESC_TYPE_MASK) {
883 case ROOT_DESC_BITMAP:
884 desc >>= ROOT_DESC_TYPE_SHIFT;
886 if ((desc & 1) && *start_root)
887 check_obj_not_in_domain ((MonoObject **)*start_root);
892 case ROOT_DESC_COMPLEX: {
893 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
894 int bwords = (int)((*bitmap_data) - 1);
895 void **start_run = start_root;
897 while (bwords-- > 0) {
898 gsize bmap = *bitmap_data++;
899 void **objptr = start_run;
901 if ((bmap & 1) && *objptr)
902 check_obj_not_in_domain ((MonoObject **)*objptr);
906 start_run += GC_BITS_PER_WORD;
910 case ROOT_DESC_USER: {
911 SgenUserRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
912 marker (start_root, check_obj_not_in_domain_callback, NULL);
915 case ROOT_DESC_RUN_LEN:
916 g_assert_not_reached ();
918 g_assert_not_reached ();
920 } SGEN_HASH_TABLE_FOREACH_END;
926 is_xdomain_ref_allowed (GCObject **ptr, GCObject *obj, MonoDomain *domain)
928 MonoObject *o = (MonoObject*)(obj);
929 MonoObject *ref = *ptr;
930 size_t offset = (char*)(ptr) - (char*)o;
932 if (o->vtable->klass == mono_defaults.thread_class && offset == G_STRUCT_OFFSET (MonoThread, internal_thread))
934 if (o->vtable->klass == mono_defaults.internal_thread_class && offset == G_STRUCT_OFFSET (MonoInternalThread, current_appcontext))
937 #ifndef DISABLE_REMOTING
938 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (o->vtable->klass, mono_defaults.real_proxy_class) &&
939 offset == G_STRUCT_OFFSET (MonoRealProxy, unwrapped_server))
942 /* Thread.cached_culture_info */
943 if (!strcmp (ref->vtable->klass->name_space, "System.Globalization") &&
944 !strcmp (ref->vtable->klass->name, "CultureInfo") &&
945 !strcmp(o->vtable->klass->name_space, "System") &&
946 !strcmp(o->vtable->klass->name, "Object[]"))
949 * at System.IO.MemoryStream.InternalConstructor (byte[],int,int,bool,bool) [0x0004d] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.IO/MemoryStream.cs:121
950 * at System.IO.MemoryStream..ctor (byte[]) [0x00017] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.IO/MemoryStream.cs:81
951 * at (wrapper remoting-invoke-with-check) System.IO.MemoryStream..ctor (byte[]) <IL 0x00020, 0xffffffff>
952 * at System.Runtime.Remoting.Messaging.CADMethodCallMessage.GetArguments () [0x0000d] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Messaging/CADMessages.cs:327
953 * at System.Runtime.Remoting.Messaging.MethodCall..ctor (System.Runtime.Remoting.Messaging.CADMethodCallMessage) [0x00017] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Messaging/MethodCall.cs:87
954 * at System.AppDomain.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage,byte[]&,System.Runtime.Remoting.Messaging.CADMethodReturnMessage&) [0x00018] in /home/schani/Work/novell/trunk/mcs/class/corlib/System/AppDomain.cs:1213
955 * at (wrapper remoting-invoke-with-check) System.AppDomain.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage,byte[]&,System.Runtime.Remoting.Messaging.CADMethodReturnMessage&) <IL 0x0003d, 0xffffffff>
956 * at System.Runtime.Remoting.Channels.CrossAppDomainSink.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage) [0x00008] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Channels/CrossAppDomainChannel.cs:198
957 * at (wrapper runtime-invoke) object.runtime_invoke_CrossAppDomainSink/ProcessMessageRes_object_object (object,intptr,intptr,intptr) <IL 0x0004c, 0xffffffff>
959 if (!strcmp (ref->vtable->klass->name_space, "System") &&
960 !strcmp (ref->vtable->klass->name, "Byte[]") &&
961 !strcmp (o->vtable->klass->name_space, "System.IO") &&
962 !strcmp (o->vtable->klass->name, "MemoryStream"))
968 check_reference_for_xdomain (GCObject **ptr, GCObject *obj, MonoDomain *domain)
970 MonoObject *ref = *ptr;
971 size_t offset = (char*)(ptr) - (char*)obj;
973 MonoClassField *field;
976 if (!ref || ref->vtable->domain == domain)
978 if (is_xdomain_ref_allowed (ptr, obj, domain))
982 for (klass = obj->vtable->klass; klass; klass = klass->parent) {
985 for (i = 0; i < klass->field.count; ++i) {
986 if (klass->fields[i].offset == offset) {
987 field = &klass->fields[i];
995 if (ref->vtable->klass == mono_defaults.string_class) {
997 str = mono_string_to_utf8_checked ((MonoString*)ref, &error);
998 mono_error_cleanup (&error);
1001 g_print ("xdomain reference in %p (%s.%s) at offset %d (%s) to %p (%s.%s) (%s) - pointed to by:\n",
1002 obj, obj->vtable->klass->name_space, obj->vtable->klass->name,
1003 offset, field ? field->name : "",
1004 ref, ref->vtable->klass->name_space, ref->vtable->klass->name, str ? str : "");
1005 mono_gc_scan_for_specific_ref (obj, TRUE);
1011 #define HANDLE_PTR(ptr,obj) check_reference_for_xdomain ((ptr), (obj), domain)
1014 scan_object_for_xdomain_refs (GCObject *obj, mword size, void *data)
1016 char *start = (char*)obj;
1017 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1018 MonoDomain *domain = vt->domain;
1019 SgenDescriptor desc = sgen_vtable_get_descriptor (vt);
1021 #include "sgen-scan-object.h"
1025 sgen_check_for_xdomain_refs (void)
1029 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1030 (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL, FALSE, TRUE);
1032 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL);
1034 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1035 scan_object_for_xdomain_refs ((GCObject*)bigobj->data, sgen_los_object_size (bigobj), NULL);
1040 /* If not null, dump the heap after each collection into this file */
1041 static FILE *heap_dump_file = NULL;
1044 sgen_dump_occupied (char *start, char *end, char *section_start)
1046 fprintf (heap_dump_file, "<occupied offset=\"%zd\" size=\"%zd\"/>\n", start - section_start, end - start);
1050 sgen_dump_section (GCMemSection *section, const char *type)
1052 char *start = section->data;
1053 char *end = section->data + section->size;
1054 char *occ_start = NULL;
1056 fprintf (heap_dump_file, "<section type=\"%s\" size=\"%lu\">\n", type, (unsigned long)section->size);
1058 while (start < end) {
1063 if (!*(void**)start) {
1065 sgen_dump_occupied (occ_start, start, section->data);
1068 start += sizeof (void*); /* should be ALLOC_ALIGN, really */
1071 g_assert (start < section->next_data);
1076 //vt = SGEN_LOAD_VTABLE (start);
1077 //class = vt->klass;
1079 size = SGEN_ALIGN_UP (safe_object_get_size ((GCObject*) start));
1082 fprintf (heap_dump_file, "<object offset=\"%d\" class=\"%s.%s\" size=\"%d\"/>\n",
1083 start - section->data,
1084 vt->klass->name_space, vt->klass->name,
1091 sgen_dump_occupied (occ_start, start, section->data);
1093 fprintf (heap_dump_file, "</section>\n");
1097 dump_object (GCObject *obj, gboolean dump_location)
1099 #ifndef SGEN_WITHOUT_MONO
1100 static char class_name [1024];
1102 MonoClass *klass = mono_object_class (obj);
1106 * Python's XML parser is too stupid to parse angle brackets
1107 * in strings, so we just ignore them;
1110 while (klass->name [i] && j < sizeof (class_name) - 1) {
1111 if (!strchr ("<>\"", klass->name [i]))
1112 class_name [j++] = klass->name [i];
1115 g_assert (j < sizeof (class_name));
1118 fprintf (heap_dump_file, "<object class=\"%s.%s\" size=\"%zd\"",
1119 klass->name_space, class_name,
1120 safe_object_get_size (obj));
1121 if (dump_location) {
1122 const char *location;
1123 if (sgen_ptr_in_nursery (obj))
1124 location = "nursery";
1125 else if (safe_object_get_size (obj) <= SGEN_MAX_SMALL_OBJ_SIZE)
1129 fprintf (heap_dump_file, " location=\"%s\"", location);
1131 fprintf (heap_dump_file, "/>\n");
1136 sgen_debug_enable_heap_dump (const char *filename)
1138 heap_dump_file = fopen (filename, "w");
1139 if (heap_dump_file) {
1140 fprintf (heap_dump_file, "<sgen-dump>\n");
1141 sgen_pin_stats_enable ();
1146 sgen_debug_dump_heap (const char *type, int num, const char *reason)
1148 SgenPointerQueue *pinned_objects;
1152 if (!heap_dump_file)
1155 fprintf (heap_dump_file, "<collection type=\"%s\" num=\"%d\"", type, num);
1157 fprintf (heap_dump_file, " reason=\"%s\"", reason);
1158 fprintf (heap_dump_file, ">\n");
1159 #ifndef SGEN_WITHOUT_MONO
1160 fprintf (heap_dump_file, "<other-mem-usage type=\"mempools\" size=\"%ld\"/>\n", mono_mempool_get_bytes_allocated ());
1162 sgen_dump_internal_mem_usage (heap_dump_file);
1163 fprintf (heap_dump_file, "<pinned type=\"stack\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_STACK));
1164 /* fprintf (heap_dump_file, "<pinned type=\"static-data\" bytes=\"%d\"/>\n", pinned_byte_counts [PIN_TYPE_STATIC_DATA]); */
1165 fprintf (heap_dump_file, "<pinned type=\"other\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_OTHER));
1167 fprintf (heap_dump_file, "<pinned-objects>\n");
1168 pinned_objects = sgen_pin_stats_get_object_list ();
1169 for (i = 0; i < pinned_objects->next_slot; ++i)
1170 dump_object ((GCObject *)pinned_objects->data [i], TRUE);
1171 fprintf (heap_dump_file, "</pinned-objects>\n");
1173 sgen_dump_section (nursery_section, "nursery");
1175 major_collector.dump_heap (heap_dump_file);
1177 fprintf (heap_dump_file, "<los>\n");
1178 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1179 dump_object ((GCObject*)bigobj->data, FALSE);
1180 fprintf (heap_dump_file, "</los>\n");
1182 fprintf (heap_dump_file, "</collection>\n");
1185 static GCObject *found_obj;
1188 find_object_for_ptr_callback (GCObject *obj, size_t size, void *user_data)
1190 char *ptr = (char *)user_data;
1192 if (ptr >= (char*)obj && ptr < (char*)obj + size) {
1193 g_assert (!found_obj);
1198 /* for use in the debugger */
1200 sgen_find_object_for_ptr (char *ptr)
1202 if (ptr >= nursery_section->data && ptr < nursery_section->end_data) {
1204 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1205 find_object_for_ptr_callback, ptr, TRUE, FALSE);
1211 sgen_los_iterate_objects (find_object_for_ptr_callback, ptr);
1216 * Very inefficient, but this is debugging code, supposed to
1217 * be called from gdb, so we don't care.
1220 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, find_object_for_ptr_callback, ptr);
1224 #endif /*HAVE_SGEN_GC*/