mono/sgen/sgen-debug.c

   1 /*
   2  * sgen-debug.c: Collector debugging
   3  *
   4  * Author:
   5  *      Paolo Molaro (lupus@ximian.com)
   6  *  Rodrigo Kumpera (kumpera@gmail.com)
   7  *
   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
  12  *
  13  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  14  */
  15
  16 #include "config.h"
  17 #ifdef HAVE_SGEN_GC
  18
  19 #include <string.h>
  20
  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"
  27
  28 #define LOAD_VTABLE     SGEN_LOAD_VTABLE
  29
  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
  33
  34 void describe_ptr (char *ptr);
  35 void check_object (GCObject *obj);
  36
  37 /*
  38  * ######################################################################
  39  * ########  Collector debugging
  40  * ######################################################################
  41  */
  42
  43 static const char*descriptor_types [] = {
  44         "INVALID",
  45         "run length",
  46         "bitmap",
  47         "small pointer-free",
  48         "complex",
  49         "vector",
  50         "complex arrray",
  51         "complex pointer-free"
  52 };
  53
  54 static char* describe_nursery_ptr (char *ptr, gboolean need_setup);
  55
  56 static void
  57 describe_pointer (char *ptr, gboolean need_setup)
  58 {
  59         GCVTable vtable;
  60         SgenDescriptor desc;
  61         int type;
  62         char *start;
  63         char *forwarded;
  64         mword size;
  65
  66  restart:
  67         if (sgen_ptr_in_nursery (ptr)) {
  68                 start = describe_nursery_ptr (ptr, need_setup);
  69                 if (!start)
  70                         return;
  71                 ptr = start;
  72                 vtable = LOAD_VTABLE ((GCObject*)ptr);
  73         } else {
  74                 if (sgen_ptr_is_in_los (ptr, &start)) {
  75                         if (ptr == start)
  76                                 printf ("Pointer is the start of object %p in LOS space.\n", start);
  77                         else
  78                                 printf ("Pointer is at offset 0x%x of object %p in LOS space.\n", (int)(ptr - start), start);
  79                         ptr = 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)) {
  83                         if (ptr == start)
  84                                 printf ("Pointer is the start of object %p in oldspace.\n", start);
  85                         else if (start)
  86                                 printf ("Pointer is at offset 0x%x of object %p in oldspace.\n", (int)(ptr - start), start);
  87                         else
  88                                 printf ("Pointer inside oldspace.\n");
  89                         if (start)
  90                                 ptr = start;
  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);
  96                 } else {
  97                         printf ("Pointer unknown.\n");
  98                         return;
  99                 }
 100         }
 101
 102         if (object_is_pinned (ptr))
 103                 printf ("Object is pinned.\n");
 104
 105         if ((forwarded = (char *)object_is_forwarded (ptr))) {
 106                 printf ("Object is forwarded to %p:\n", forwarded);
 107                 ptr = forwarded;
 108                 goto restart;
 109         }
 110
 111         printf ("VTable: %p\n", vtable);
 112         if (vtable == NULL) {
 113                 printf ("VTable is invalid (empty).\n");
 114                 goto invalid_vtable;
 115         }
 116         if (sgen_ptr_in_nursery (vtable)) {
 117                 printf ("VTable is invalid (points inside nursery).\n");
 118                 goto invalid_vtable;
 119         }
 120         printf ("Class: %s.%s\n", sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
 121
 122         desc = sgen_vtable_get_descriptor (vtable);
 123         printf ("Descriptor: %lx\n", (long)desc);
 124
 125         type = desc & DESC_TYPE_MASK;
 126         printf ("Descriptor type: %d (%s)\n", type, descriptor_types [type]);
 127
 128         size = sgen_safe_object_get_size ((GCObject*)ptr);
 129         printf ("Size: %d\n", (int)size);
 130
 131  invalid_vtable:
 132         ;
 133         sgen_client_describe_invalid_pointer ((GCObject *) ptr);
 134 }
 135
 136 void
 137 describe_ptr (char *ptr)
 138 {
 139         describe_pointer (ptr, TRUE);
 140 }
 141
 142 static gboolean missing_remsets;
 143
 144 /*
 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.
 149  */
 150 #undef HANDLE_PTR
 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;                                                                 \
 159                 }                                                                                                                               \
 160         }                                                                                                                                       \
 161         } while (0)
 162
 163 /*
 164  * Check that each object reference which points into the nursery can
 165  * be found in the remembered sets.
 166  */
 167 static void
 168 check_consistency_callback (GCObject *obj, size_t size, void *dummy)
 169 {
 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));
 174
 175 #include "sgen-scan-object.h"
 176 }
 177
 178 /*
 179  * Perform consistency check of the heap.
 180  *
 181  * Assumes the world is stopped.
 182  */
 183 void
 184 sgen_check_consistency (void)
 185 {
 186         // Need to add more checks
 187
 188         missing_remsets = FALSE;
 189
 190         SGEN_LOG (1, "Begin heap consistency check...");
 191
 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);
 194
 195         sgen_los_iterate_objects ((IterateObjectCallbackFunc)check_consistency_callback, NULL);
 196
 197         SGEN_LOG (1, "Heap consistency check done.");
 198
 199         if (!binary_protocol_is_enabled ())
 200                 g_assert (!missing_remsets);
 201 }
 202
 203 static gboolean
 204 is_major_or_los_object_marked (GCObject *obj)
 205 {
 206         if (sgen_safe_object_get_size ((GCObject*)obj) > SGEN_MAX_SMALL_OBJ_SIZE) {
 207                 return sgen_los_object_is_pinned (obj);
 208         } else {
 209                 return sgen_get_major_collector ()->is_object_live (obj);
 210         }
 211 }
 212
 213 #undef HANDLE_PTR
 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;                         \
 221                 }                                                                                                                               \
 222         }                                                                                                                                       \
 223         } while (0)
 224
 225 static void
 226 check_mod_union_callback (GCObject *obj, size_t size, void *dummy)
 227 {
 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);
 232         guint8 *cards;
 233         SGEN_LOG (8, "Scanning object %p, vtable: %p (%s)", obj, vt, sgen_client_vtable_get_name (vt));
 234
 235         if (!is_major_or_los_object_marked (obj))
 236                 return;
 237
 238         if (in_los)
 239                 cards = sgen_los_header_for_object (obj)->cardtable_mod_union;
 240         else
 241                 cards = sgen_get_major_collector ()->get_cardtable_mod_union_for_reference (start);
 242
 243         SGEN_ASSERT (0, cards, "we must have mod union for marked major objects");
 244
 245 #include "sgen-scan-object.h"
 246 }
 247
 248 void
 249 sgen_check_mod_union_consistency (void)
 250 {
 251         missing_remsets = FALSE;
 252
 253         major_collector.iterate_objects (ITERATE_OBJECTS_ALL, (IterateObjectCallbackFunc)check_mod_union_callback, (void*)FALSE);
 254
 255         sgen_los_iterate_objects ((IterateObjectCallbackFunc)check_mod_union_callback, (void*)TRUE);
 256
 257         if (!binary_protocol_is_enabled ())
 258                 g_assert (!missing_remsets);
 259 }
 260
 261 #undef HANDLE_PTR
 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)); \
 265         } while (0)
 266
 267 static void
 268 check_major_refs_callback (GCObject *obj, size_t size, void *dummy)
 269 {
 270         char *start = (char*)obj;
 271         SgenDescriptor desc = sgen_obj_get_descriptor (obj);
 272
 273 #include "sgen-scan-object.h"
 274 }
 275
 276 void
 277 sgen_check_major_refs (void)
 278 {
 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);
 281 }
 282
 283 /* Check that the reference is valid */
 284 #undef HANDLE_PTR
 285 #define HANDLE_PTR(ptr,obj)     do {    \
 286                 if (*(ptr)) {   \
 287                         g_assert (sgen_client_vtable_get_namespace (SGEN_LOAD_VTABLE_UNCHECKED (*(ptr))));      \
 288                 }       \
 289         } while (0)
 290
 291 /*
 292  * check_object:
 293  *
 294  *   Perform consistency check on an object. Currently we only check that the
 295  * reference fields are valid.
 296  */
 297 void
 298 check_object (GCObject *obj)
 299 {
 300         char *start = (char*)obj;
 301         SgenDescriptor desc;
 302
 303         if (!start)
 304                 return;
 305
 306         desc = sgen_obj_get_descriptor (obj);
 307
 308 #include "sgen-scan-object.h"
 309 }
 310
 311
 312 static GCObject **valid_nursery_objects;
 313 static int valid_nursery_object_count;
 314 static gboolean broken_heap;
 315
 316 static void
 317 setup_mono_sgen_scan_area_with_callback (GCObject *object, size_t size, void *data)
 318 {
 319         valid_nursery_objects [valid_nursery_object_count++] = object;
 320 }
 321
 322 static void
 323 setup_valid_nursery_objects (void)
 324 {
 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);
 329 }
 330
 331 static gboolean
 332 find_object_in_nursery_dump (char *object)
 333 {
 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])
 338                         return TRUE;
 339
 340                 if (object < (char*)valid_nursery_objects [middle])
 341                         last = middle;
 342                 else
 343                         first = middle + 1;
 344         }
 345         g_assert (first == last);
 346         return FALSE;
 347 }
 348
 349 static void
 350 iterate_valid_nursery_objects (IterateObjectCallbackFunc callback, void *data)
 351 {
 352         int i;
 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);
 356         }
 357 }
 358
 359 static char*
 360 describe_nursery_ptr (char *ptr, gboolean need_setup)
 361 {
 362         int i;
 363
 364         if (need_setup)
 365                 setup_valid_nursery_objects ();
 366
 367         for (i = 0; i < valid_nursery_object_count - 1; ++i) {
 368                 if ((char*)valid_nursery_objects [i + 1] > ptr)
 369                         break;
 370         }
 371
 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)");
 374                 return NULL;
 375         } else {
 376                 GCObject *obj = valid_nursery_objects [i];
 377                 if ((char*)obj == ptr)
 378                         SGEN_LOG (0, "nursery-ptr %p", obj);
 379                 else
 380                         SGEN_LOG (0, "nursery-ptr %p (interior-ptr offset %zd)", obj, ptr - (char*)obj);
 381                 return (char*)obj;
 382         }
 383 }
 384
 385 static gboolean
 386 is_valid_object_pointer (char *object)
 387 {
 388         if (sgen_ptr_in_nursery (object))
 389                 return find_object_in_nursery_dump (object);
 390
 391         if (sgen_los_is_valid_object (object))
 392                 return TRUE;
 393
 394         if (major_collector.is_valid_object (object))
 395                 return TRUE;
 396         return FALSE;
 397 }
 398
 399 static void
 400 bad_pointer_spew (char *obj, char **slot)
 401 {
 402         char *ptr = *slot;
 403         GCVTable vtable = LOAD_VTABLE ((GCObject*)obj);
 404
 405         SGEN_LOG (0, "Invalid object pointer %p at offset %zd in object %p (%s.%s):", ptr,
 406                         (char*)slot - obj,
 407                         obj, sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
 408         describe_pointer (ptr, FALSE);
 409         broken_heap = TRUE;
 410 }
 411
 412 static void
 413 missing_remset_spew (char *obj, char **slot)
 414 {
 415         char *ptr = *slot;
 416         GCVTable vtable = LOAD_VTABLE ((GCObject*)obj);
 417
 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));
 421
 422         broken_heap = TRUE;
 423 }
 424
 425 /*
 426 FIXME Flag missing remsets due to pinning as non fatal
 427 */
 428 #undef HANDLE_PTR
 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);  \
 436                         }       \
 437         } \
 438         } while (0)
 439
 440 static void
 441 verify_object_pointers_callback (GCObject *obj, size_t size, void *data)
 442 {
 443         char *start = (char*)obj;
 444         gboolean allow_missing_pinned = (gboolean) (size_t) data;
 445         SgenDescriptor desc = sgen_obj_get_descriptor (obj);
 446
 447 #include "sgen-scan-object.h"
 448 }
 449
 450 /*
 451 FIXME:
 452 -This heap checker is racy regarding inlined write barriers and other JIT tricks that
 453 depend on OP_DUMMY_USE.
 454 */
 455 void
 456 sgen_check_whole_heap (gboolean allow_missing_pinned)
 457 {
 458         setup_valid_nursery_objects ();
 459
 460         broken_heap = FALSE;
 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);
 464
 465         g_assert (!broken_heap);
 466 }
 467
 468 static gboolean
 469 ptr_in_heap (char *object)
 470 {
 471         if (sgen_ptr_in_nursery (object))
 472                 return TRUE;
 473
 474         if (sgen_los_is_valid_object (object))
 475                 return TRUE;
 476
 477         if (major_collector.is_valid_object (object))
 478                 return TRUE;
 479         return FALSE;
 480 }
 481
 482 /*
 483  * sgen_check_objref:
 484  *   Do consistency checks on the object reference OBJ. Assert on failure.
 485  */
 486 void
 487 sgen_check_objref (char *obj)
 488 {
 489         g_assert (ptr_in_heap (obj));
 490 }
 491
 492 static void
 493 find_pinning_ref_from_thread (char *obj, size_t size)
 494 {
 495 #ifndef SGEN_WITHOUT_MONO
 496         int j;
 497         char *endobj = obj + size;
 498
 499         FOREACH_THREAD (info) {
 500                 char **start = (char**)info->client_info.stack_start;
 501                 if (info->client_info.skip || info->client_info.gc_disabled)
 502                         continue;
 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);
 506                         start++;
 507                 }
 508
 509                 for (j = 0; j < ARCH_NUM_REGS; ++j) {
 510 #ifdef USE_MONO_CTX
 511                         mword w = ((mword*)&info->client_info.ctx) [j];
 512 #else
 513                         mword w = (mword)&info->client_info.regs [j];
 514 #endif
 515
 516                         if (w >= (mword)obj && w < (mword)obj + size)
 517                                 SGEN_LOG (0, "Object %p referenced in saved reg %d of thread %p (id %p)", obj, j, info, (gpointer)mono_thread_info_get_tid (info));
 518                 }
 519         } FOREACH_THREAD_END
 520 #endif
 521 }
 522
 523 /*
 524  * Debugging function: find in the conservative roots where @obj is being pinned.
 525  */
 526 static G_GNUC_UNUSED void
 527 find_pinning_reference (char *obj, size_t size)
 528 {
 529         char **start;
 530         RootRecord *root;
 531         char *endobj = obj + size;
 532
 533         SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_NORMAL], char **, start, RootRecord *, root) {
 534                 /* if desc is non-null it has precise info */
 535                 if (!root->root_desc) {
 536                         while (start < (char**)root->end_root) {
 537                                 if (*start >= obj && *start < endobj) {
 538                                         SGEN_LOG (0, "Object %p referenced in pinned roots %p-%p\n", obj, start, root->end_root);
 539                                 }
 540                                 start++;
 541                         }
 542                 }
 543         } SGEN_HASH_TABLE_FOREACH_END;
 544
 545         find_pinning_ref_from_thread (obj, size);
 546 }
 547
 548 #undef HANDLE_PTR
 549 #define HANDLE_PTR(ptr,obj)     do {                                    \
 550                 char* __target = *(char**)ptr;                          \
 551                 if (__target) {                                         \
 552                         if (sgen_ptr_in_nursery (__target)) {           \
 553                                 g_assert (!SGEN_OBJECT_IS_FORWARDED (__target)); \
 554                         } else {                                        \
 555                                 mword __size = sgen_safe_object_get_size ((GCObject*)__target); \
 556                                 if (__size <= SGEN_MAX_SMALL_OBJ_SIZE)  \
 557                                         g_assert (major_collector.is_object_live ((GCObject*)__target)); \
 558                                 else                                    \
 559                                         g_assert (sgen_los_object_is_pinned ((GCObject*)__target)); \
 560                         }                                               \
 561                 }                                                       \
 562         } while (0)
 563
 564 static void
 565 check_marked_callback (GCObject *obj, size_t size, void *dummy)
 566 {
 567         char *start = (char*)obj;
 568         gboolean flag = (gboolean) (size_t) dummy;
 569         SgenDescriptor desc;
 570
 571         if (sgen_ptr_in_nursery (start)) {
 572                 if (flag)
 573                         SGEN_ASSERT (0, SGEN_OBJECT_IS_PINNED (obj), "All objects remaining in the nursery must be pinned");
 574         } else if (flag) {
 575                 if (!sgen_los_object_is_pinned (obj))
 576                         return;
 577         } else {
 578                 if (!major_collector.is_object_live (obj))
 579                         return;
 580         }
 581
 582         desc = sgen_obj_get_descriptor_safe (obj);
 583
 584 #include "sgen-scan-object.h"
 585 }
 586
 587 void
 588 sgen_check_heap_marked (gboolean nursery_must_be_pinned)
 589 {
 590         setup_valid_nursery_objects ();
 591
 592         iterate_valid_nursery_objects (check_marked_callback, (void*)(size_t)nursery_must_be_pinned);
 593         major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, check_marked_callback, (void*)FALSE);
 594         sgen_los_iterate_objects (check_marked_callback, (void*)TRUE);
 595 }
 596
 597 static void
 598 check_nursery_objects_pinned_callback (char *obj, size_t size, void *data /* ScanCopyContext *ctx */)
 599 {
 600         gboolean pinned = (gboolean) (size_t) data;
 601
 602         g_assert (!SGEN_OBJECT_IS_FORWARDED (obj));
 603         if (pinned)
 604                 g_assert (SGEN_OBJECT_IS_PINNED (obj));
 605         else
 606                 g_assert (!SGEN_OBJECT_IS_PINNED (obj));
 607 }
 608
 609 void
 610 sgen_check_nursery_objects_pinned (gboolean pinned)
 611 {
 612         sgen_clear_nursery_fragments ();
 613         sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
 614                         (IterateObjectCallbackFunc)check_nursery_objects_pinned_callback, (void*) (size_t) pinned /* (void*)&ctx */, FALSE, TRUE);
 615 }
 616
 617 static void
 618 verify_scan_starts (char *start, char *end)
 619 {
 620         size_t i;
 621
 622         for (i = 0; i < nursery_section->num_scan_start; ++i) {
 623                 char *addr = nursery_section->scan_starts [i];
 624                 if (addr > start && addr < end)
 625                         SGEN_LOG (0, "NFC-BAD SCAN START [%zu] %p for obj [%p %p]", i, addr, start, end);
 626         }
 627 }
 628
 629 void
 630 sgen_debug_verify_nursery (gboolean do_dump_nursery_content)
 631 {
 632         char *start, *end, *cur, *hole_start;
 633
 634         if (nursery_canaries_enabled ())
 635                 SGEN_LOG (0, "Checking nursery canaries...");
 636
 637         /*This cleans up unused fragments */
 638         sgen_nursery_allocator_prepare_for_pinning ();
 639
 640         hole_start = start = cur = sgen_get_nursery_start ();
 641         end = sgen_get_nursery_end ();
 642
 643         while (cur < end) {
 644                 size_t ss, size;
 645                 gboolean is_array_fill;
 646
 647                 if (!*(void**)cur) {
 648                         cur += sizeof (void*);
 649                         continue;
 650                 }
 651
 652                 if (object_is_forwarded (cur))
 653                         SGEN_LOG (0, "FORWARDED OBJ %p", cur);
 654                 else if (object_is_pinned (cur))
 655                         SGEN_LOG (0, "PINNED OBJ %p", cur);
 656
 657                 ss = safe_object_get_size ((GCObject*)cur);
 658                 size = SGEN_ALIGN_UP (ss);
 659                 verify_scan_starts (cur, cur + size);
 660                 is_array_fill = sgen_client_object_is_array_fill ((GCObject*)cur);
 661                 if (do_dump_nursery_content) {
 662                         GCVTable vtable = SGEN_LOAD_VTABLE ((GCObject*)cur);
 663                         if (cur > hole_start)
 664                                 SGEN_LOG (0, "HOLE [%p %p %d]", hole_start, cur, (int)(cur - hole_start));
 665                         SGEN_LOG (0, "OBJ  [%p %p %d %d %s.%s %d]", cur, cur + size, (int)size, (int)ss,
 666                                         sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable),
 667                                         is_array_fill);
 668                 }
 669                 if (nursery_canaries_enabled () && !is_array_fill) {
 670                         CHECK_CANARY_FOR_OBJECT ((GCObject*)cur, TRUE);
 671                         CANARIFY_SIZE (size);
 672                 }
 673                 cur += size;
 674                 hole_start = cur;
 675         }
 676 }
 677
 678 /*
 679  * Checks that no objects in the nursery are fowarded or pinned.  This
 680  * is a precondition to restarting the mutator while doing a
 681  * concurrent collection.  Note that we don't clear fragments because
 682  * we depend on that having happened earlier.
 683  */
 684 void
 685 sgen_debug_check_nursery_is_clean (void)
 686 {
 687         char *end, *cur;
 688
 689         cur = sgen_get_nursery_start ();
 690         end = sgen_get_nursery_end ();
 691
 692         while (cur < end) {
 693                 size_t size;
 694
 695                 if (!*(void**)cur) {
 696                         cur += sizeof (void*);
 697                         continue;
 698                 }
 699
 700                 g_assert (!object_is_forwarded (cur));
 701                 g_assert (!object_is_pinned (cur));
 702
 703                 size = SGEN_ALIGN_UP (safe_object_get_size ((GCObject*)cur));
 704                 verify_scan_starts (cur, cur + size);
 705
 706                 cur += size;
 707         }
 708 }
 709
 710 static gboolean scan_object_for_specific_ref_precise = TRUE;
 711
 712 #undef HANDLE_PTR
 713 #define HANDLE_PTR(ptr,obj) do {                                        \
 714                 if ((GCObject*)*(ptr) == key) {                         \
 715                         GCVTable vtable = SGEN_LOAD_VTABLE (*(ptr));    \
 716                         g_print ("found ref to %p in object %p (%s.%s) at offset %zd\n", \
 717                                         key, (obj), sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable), ((char*)(ptr) - (char*)(obj))); \
 718                 }                                                       \
 719         } while (0)
 720
 721 static void
 722 scan_object_for_specific_ref (GCObject *obj, GCObject *key)
 723 {
 724         GCObject *forwarded;
 725
 726         if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj)))
 727                 obj = forwarded;
 728
 729         if (scan_object_for_specific_ref_precise) {
 730                 char *start = (char*)obj;
 731                 SgenDescriptor desc = sgen_obj_get_descriptor_safe (obj);
 732                 #include "sgen-scan-object.h"
 733         } else {
 734                 mword *words = (mword*)obj;
 735                 size_t size = safe_object_get_size (obj);
 736                 int i;
 737                 for (i = 0; i < size / sizeof (mword); ++i) {
 738                         if (words [i] == (mword)key) {
 739                                 GCVTable vtable = SGEN_LOAD_VTABLE (obj);
 740                                 g_print ("found possible ref to %p in object %p (%s.%s) at offset %zd\n",
 741                                                 key, obj, sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable), i * sizeof (mword));
 742                         }
 743                 }
 744         }
 745 }
 746
 747 static void
 748 scan_object_for_specific_ref_callback (GCObject *obj, size_t size, GCObject *key)
 749 {
 750         scan_object_for_specific_ref (obj, key);
 751 }
 752
 753 static void
 754 check_root_obj_specific_ref (RootRecord *root, GCObject *key, GCObject *obj)
 755 {
 756         if (key != obj)
 757                 return;
 758         g_print ("found ref to %p in root record %p\n", key, root);
 759 }
 760
 761 static GCObject *check_key = NULL;
 762 static RootRecord *check_root = NULL;
 763
 764 static void
 765 check_root_obj_specific_ref_from_marker (GCObject **obj, void *gc_data)
 766 {
 767         check_root_obj_specific_ref (check_root, check_key, *obj);
 768 }
 769
 770 static void
 771 scan_roots_for_specific_ref (GCObject *key, int root_type)
 772 {
 773         void **start_root;
 774         RootRecord *root;
 775         check_key = key;
 776
 777         SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
 778                 SgenDescriptor desc = root->root_desc;
 779
 780                 check_root = root;
 781
 782                 switch (desc & ROOT_DESC_TYPE_MASK) {
 783                 case ROOT_DESC_BITMAP:
 784                         desc >>= ROOT_DESC_TYPE_SHIFT;
 785                         while (desc) {
 786                                 if (desc & 1)
 787                                         check_root_obj_specific_ref (root, key, (GCObject *)*start_root);
 788                                 desc >>= 1;
 789                                 start_root++;
 790                         }
 791                         return;
 792                 case ROOT_DESC_COMPLEX: {
 793                         gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
 794                         int bwords = (int) ((*bitmap_data) - 1);
 795                         void **start_run = start_root;
 796                         bitmap_data++;
 797                         while (bwords-- > 0) {
 798                                 gsize bmap = *bitmap_data++;
 799                                 void **objptr = start_run;
 800                                 while (bmap) {
 801                                         if (bmap & 1)
 802                                                 check_root_obj_specific_ref (root, key, (GCObject *)*objptr);
 803                                         bmap >>= 1;
 804                                         ++objptr;
 805                                 }
 806                                 start_run += GC_BITS_PER_WORD;
 807                         }
 808                         break;
 809                 }
 810                 case ROOT_DESC_USER: {
 811                         SgenUserRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
 812                         marker (start_root, check_root_obj_specific_ref_from_marker, NULL);
 813                         break;
 814                 }
 815                 case ROOT_DESC_RUN_LEN:
 816                         g_assert_not_reached ();
 817                 default:
 818                         g_assert_not_reached ();
 819                 }
 820         } SGEN_HASH_TABLE_FOREACH_END;
 821
 822         check_key = NULL;
 823         check_root = NULL;
 824 }
 825
 826 void
 827 mono_gc_scan_for_specific_ref (GCObject *key, gboolean precise)
 828 {
 829         void **ptr;
 830         RootRecord *root;
 831
 832         scan_object_for_specific_ref_precise = precise;
 833
 834         sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
 835                         (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key, TRUE, FALSE);
 836
 837         major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
 838
 839         sgen_los_iterate_objects ((IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
 840
 841         scan_roots_for_specific_ref (key, ROOT_TYPE_NORMAL);
 842         scan_roots_for_specific_ref (key, ROOT_TYPE_WBARRIER);
 843
 844         SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_PINNED], void **, ptr, RootRecord *, root) {
 845                 while (ptr < (void**)root->end_root) {
 846                         check_root_obj_specific_ref (root, (GCObject *)*ptr, key);
 847                         ++ptr;
 848                 }
 849         } SGEN_HASH_TABLE_FOREACH_END;
 850
 851         if (sgen_is_world_stopped ())
 852                 find_pinning_ref_from_thread ((char*)key, sizeof (GCObject));
 853 }
 854
 855 #ifndef SGEN_WITHOUT_MONO
 856
 857 static MonoDomain *check_domain = NULL;
 858
 859 static void
 860 check_obj_not_in_domain (MonoObject **o)
 861 {
 862         g_assert (((*o))->vtable->domain != check_domain);
 863 }
 864
 865
 866 static void
 867 check_obj_not_in_domain_callback (GCObject **o, void *gc_data)
 868 {
 869         g_assert ((*o)->vtable->domain != check_domain);
 870 }
 871
 872 void
 873 sgen_scan_for_registered_roots_in_domain (MonoDomain *domain, int root_type)
 874 {
 875         void **start_root;
 876         RootRecord *root;
 877         check_domain = domain;
 878         SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
 879                 SgenDescriptor desc = root->root_desc;
 880
 881                 /* The MonoDomain struct is allowed to hold
 882                    references to objects in its own domain. */
 883                 if (start_root == (void**)domain)
 884                         continue;
 885
 886                 switch (desc & ROOT_DESC_TYPE_MASK) {
 887                 case ROOT_DESC_BITMAP:
 888                         desc >>= ROOT_DESC_TYPE_SHIFT;
 889                         while (desc) {
 890                                 if ((desc & 1) && *start_root)
 891                                         check_obj_not_in_domain ((MonoObject **)*start_root);
 892                                 desc >>= 1;
 893                                 start_root++;
 894                         }
 895                         break;
 896                 case ROOT_DESC_COMPLEX: {
 897                         gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
 898                         int bwords = (int)((*bitmap_data) - 1);
 899                         void **start_run = start_root;
 900                         bitmap_data++;
 901                         while (bwords-- > 0) {
 902                                 gsize bmap = *bitmap_data++;
 903                                 void **objptr = start_run;
 904                                 while (bmap) {
 905                                         if ((bmap & 1) && *objptr)
 906                                                 check_obj_not_in_domain ((MonoObject **)*objptr);
 907                                         bmap >>= 1;
 908                                         ++objptr;
 909                                 }
 910                                 start_run += GC_BITS_PER_WORD;
 911                         }
 912                         break;
 913                 }
 914                 case ROOT_DESC_USER: {
 915                         SgenUserRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
 916                         marker (start_root, check_obj_not_in_domain_callback, NULL);
 917                         break;
 918                 }
 919                 case ROOT_DESC_RUN_LEN:
 920                         g_assert_not_reached ();
 921                 default:
 922                         g_assert_not_reached ();
 923                 }
 924         } SGEN_HASH_TABLE_FOREACH_END;
 925
 926         check_domain = NULL;
 927 }
 928
 929 static gboolean
 930 is_xdomain_ref_allowed (GCObject **ptr, GCObject *obj, MonoDomain *domain)
 931 {
 932         MonoObject *o = (MonoObject*)(obj);
 933         MonoObject *ref = *ptr;
 934         size_t offset = (char*)(ptr) - (char*)o;
 935
 936         if (o->vtable->klass == mono_defaults.thread_class && offset == G_STRUCT_OFFSET (MonoThread, internal_thread))
 937                 return TRUE;
 938         if (o->vtable->klass == mono_defaults.internal_thread_class && offset == G_STRUCT_OFFSET (MonoInternalThread, current_appcontext))
 939                 return TRUE;
 940
 941 #ifndef DISABLE_REMOTING
 942         if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (o->vtable->klass, mono_defaults.real_proxy_class) &&
 943                         offset == G_STRUCT_OFFSET (MonoRealProxy, unwrapped_server))
 944                 return TRUE;
 945 #endif
 946         /* Thread.cached_culture_info */
 947         if (!strcmp (ref->vtable->klass->name_space, "System.Globalization") &&
 948                         !strcmp (ref->vtable->klass->name, "CultureInfo") &&
 949                         !strcmp(o->vtable->klass->name_space, "System") &&
 950                         !strcmp(o->vtable->klass->name, "Object[]"))
 951                 return TRUE;
 952         /*
 953          *  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
 954          * at System.IO.MemoryStream..ctor (byte[]) [0x00017] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.IO/MemoryStream.cs:81
 955          * at (wrapper remoting-invoke-with-check) System.IO.MemoryStream..ctor (byte[]) <IL 0x00020, 0xffffffff>
 956          * at System.Runtime.Remoting.Messaging.CADMethodCallMessage.GetArguments () [0x0000d] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Messaging/CADMessages.cs:327
 957          * 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
 958          * 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
 959          * at (wrapper remoting-invoke-with-check) System.AppDomain.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage,byte[]&,System.Runtime.Remoting.Messaging.CADMethodReturnMessage&) <IL 0x0003d, 0xffffffff>
 960          * 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
 961          * at (wrapper runtime-invoke) object.runtime_invoke_CrossAppDomainSink/ProcessMessageRes_object_object (object,intptr,intptr,intptr) <IL 0x0004c, 0xffffffff>
 962          */
 963         if (!strcmp (ref->vtable->klass->name_space, "System") &&
 964                         !strcmp (ref->vtable->klass->name, "Byte[]") &&
 965                         !strcmp (o->vtable->klass->name_space, "System.IO") &&
 966                         !strcmp (o->vtable->klass->name, "MemoryStream"))
 967                 return TRUE;
 968         return FALSE;
 969 }
 970
 971 static void
 972 check_reference_for_xdomain (GCObject **ptr, GCObject *obj, MonoDomain *domain)
 973 {
 974         MonoObject *ref = *ptr;
 975         size_t offset = (char*)(ptr) - (char*)obj;
 976         MonoClass *klass;
 977         MonoClassField *field;
 978         char *str;
 979
 980         if (!ref || ref->vtable->domain == domain)
 981                 return;
 982         if (is_xdomain_ref_allowed (ptr, obj, domain))
 983                 return;
 984
 985         field = NULL;
 986         for (klass = obj->vtable->klass; klass; klass = klass->parent) {
 987                 int i;
 988
 989                 for (i = 0; i < klass->field.count; ++i) {
 990                         if (klass->fields[i].offset == offset) {
 991                                 field = &klass->fields[i];
 992                                 break;
 993                         }
 994                 }
 995                 if (field)
 996                         break;
 997         }
 998
 999         if (ref->vtable->klass == mono_defaults.string_class)
1000                 str = mono_string_to_utf8 ((MonoString*)ref);
1001         else
1002                 str = NULL;
1003         g_print ("xdomain reference in %p (%s.%s) at offset %d (%s) to %p (%s.%s) (%s)  -  pointed to by:\n",
1004                         obj, obj->vtable->klass->name_space, obj->vtable->klass->name,
1005                         offset, field ? field->name : "",
1006                         ref, ref->vtable->klass->name_space, ref->vtable->klass->name, str ? str : "");
1007         mono_gc_scan_for_specific_ref (obj, TRUE);
1008         if (str)
1009                 g_free (str);
1010 }
1011
1012 #undef HANDLE_PTR
1013 #define HANDLE_PTR(ptr,obj)     check_reference_for_xdomain ((ptr), (obj), domain)
1014
1015 static void
1016 scan_object_for_xdomain_refs (GCObject *obj, mword size, void *data)
1017 {
1018         char *start = (char*)obj;
1019         MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1020         MonoDomain *domain = vt->domain;
1021         SgenDescriptor desc = sgen_vtable_get_descriptor (vt);
1022
1023         #include "sgen-scan-object.h"
1024 }
1025
1026 void
1027 sgen_check_for_xdomain_refs (void)
1028 {
1029         LOSObject *bigobj;
1030
1031         sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1032                         (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL, FALSE, TRUE);
1033
1034         major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL);
1035
1036         for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1037                 scan_object_for_xdomain_refs ((GCObject*)bigobj->data, sgen_los_object_size (bigobj), NULL);
1038 }
1039
1040 #endif
1041
1042 /* If not null, dump the heap after each collection into this file */
1043 static FILE *heap_dump_file = NULL;
1044
1045 void
1046 sgen_dump_occupied (char *start, char *end, char *section_start)
1047 {
1048         fprintf (heap_dump_file, "<occupied offset=\"%zd\" size=\"%zd\"/>\n", start - section_start, end - start);
1049 }
1050
1051 void
1052 sgen_dump_section (GCMemSection *section, const char *type)
1053 {
1054         char *start = section->data;
1055         char *end = section->data + section->size;
1056         char *occ_start = NULL;
1057
1058         fprintf (heap_dump_file, "<section type=\"%s\" size=\"%lu\">\n", type, (unsigned long)section->size);
1059
1060         while (start < end) {
1061                 guint size;
1062                 //GCVTable vt;
1063                 //MonoClass *class;
1064
1065                 if (!*(void**)start) {
1066                         if (occ_start) {
1067                                 sgen_dump_occupied (occ_start, start, section->data);
1068                                 occ_start = NULL;
1069                         }
1070                         start += sizeof (void*); /* should be ALLOC_ALIGN, really */
1071                         continue;
1072                 }
1073                 g_assert (start < section->next_data);
1074
1075                 if (!occ_start)
1076                         occ_start = start;
1077
1078                 //vt = SGEN_LOAD_VTABLE (start);
1079                 //class = vt->klass;
1080
1081                 size = SGEN_ALIGN_UP (safe_object_get_size ((GCObject*) start));
1082
1083                 /*
1084                 fprintf (heap_dump_file, "<object offset=\"%d\" class=\"%s.%s\" size=\"%d\"/>\n",
1085                                 start - section->data,
1086                                 vt->klass->name_space, vt->klass->name,
1087                                 size);
1088                 */
1089
1090                 start += size;
1091         }
1092         if (occ_start)
1093                 sgen_dump_occupied (occ_start, start, section->data);
1094
1095         fprintf (heap_dump_file, "</section>\n");
1096 }
1097
1098 static void
1099 dump_object (GCObject *obj, gboolean dump_location)
1100 {
1101 #ifndef SGEN_WITHOUT_MONO
1102         static char class_name [1024];
1103
1104         MonoClass *klass = mono_object_class (obj);
1105         int i, j;
1106
1107         /*
1108          * Python's XML parser is too stupid to parse angle brackets
1109          * in strings, so we just ignore them;
1110          */
1111         i = j = 0;
1112         while (klass->name [i] && j < sizeof (class_name) - 1) {
1113                 if (!strchr ("<>\"", klass->name [i]))
1114                         class_name [j++] = klass->name [i];
1115                 ++i;
1116         }
1117         g_assert (j < sizeof (class_name));
1118         class_name [j] = 0;
1119
1120         fprintf (heap_dump_file, "<object class=\"%s.%s\" size=\"%zd\"",
1121                         klass->name_space, class_name,
1122                         safe_object_get_size (obj));
1123         if (dump_location) {
1124                 const char *location;
1125                 if (sgen_ptr_in_nursery (obj))
1126                         location = "nursery";
1127                 else if (safe_object_get_size (obj) <= SGEN_MAX_SMALL_OBJ_SIZE)
1128                         location = "major";
1129                 else
1130                         location = "LOS";
1131                 fprintf (heap_dump_file, " location=\"%s\"", location);
1132         }
1133         fprintf (heap_dump_file, "/>\n");
1134 #endif
1135 }
1136
1137 void
1138 sgen_debug_enable_heap_dump (const char *filename)
1139 {
1140         heap_dump_file = fopen (filename, "w");
1141         if (heap_dump_file) {
1142                 fprintf (heap_dump_file, "<sgen-dump>\n");
1143                 sgen_pin_stats_enable ();
1144         }
1145 }
1146
1147 void
1148 sgen_debug_dump_heap (const char *type, int num, const char *reason)
1149 {
1150         SgenPointerQueue *pinned_objects;
1151         LOSObject *bigobj;
1152         int i;
1153
1154         if (!heap_dump_file)
1155                 return;
1156
1157         fprintf (heap_dump_file, "<collection type=\"%s\" num=\"%d\"", type, num);
1158         if (reason)
1159                 fprintf (heap_dump_file, " reason=\"%s\"", reason);
1160         fprintf (heap_dump_file, ">\n");
1161 #ifndef SGEN_WITHOUT_MONO
1162         fprintf (heap_dump_file, "<other-mem-usage type=\"mempools\" size=\"%ld\"/>\n", mono_mempool_get_bytes_allocated ());
1163 #endif
1164         sgen_dump_internal_mem_usage (heap_dump_file);
1165         fprintf (heap_dump_file, "<pinned type=\"stack\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_STACK));
1166         /* fprintf (heap_dump_file, "<pinned type=\"static-data\" bytes=\"%d\"/>\n", pinned_byte_counts [PIN_TYPE_STATIC_DATA]); */
1167         fprintf (heap_dump_file, "<pinned type=\"other\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_OTHER));
1168
1169         fprintf (heap_dump_file, "<pinned-objects>\n");
1170         pinned_objects = sgen_pin_stats_get_object_list ();
1171         for (i = 0; i < pinned_objects->next_slot; ++i)
1172                 dump_object ((GCObject *)pinned_objects->data [i], TRUE);
1173         fprintf (heap_dump_file, "</pinned-objects>\n");
1174
1175         sgen_dump_section (nursery_section, "nursery");
1176
1177         major_collector.dump_heap (heap_dump_file);
1178
1179         fprintf (heap_dump_file, "<los>\n");
1180         for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1181                 dump_object ((GCObject*)bigobj->data, FALSE);
1182         fprintf (heap_dump_file, "</los>\n");
1183
1184         fprintf (heap_dump_file, "</collection>\n");
1185 }
1186
1187 static GCObject *found_obj;
1188
1189 static void
1190 find_object_for_ptr_callback (GCObject *obj, size_t size, void *user_data)
1191 {
1192         char *ptr = (char *)user_data;
1193
1194         if (ptr >= (char*)obj && ptr < (char*)obj + size) {
1195                 g_assert (!found_obj);
1196                 found_obj = obj;
1197         }
1198 }
1199
1200 /* for use in the debugger */
1201 GCObject*
1202 sgen_find_object_for_ptr (char *ptr)
1203 {
1204         if (ptr >= nursery_section->data && ptr < nursery_section->end_data) {
1205                 found_obj = NULL;
1206                 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1207                                 find_object_for_ptr_callback, ptr, TRUE, FALSE);
1208                 if (found_obj)
1209                         return found_obj;
1210         }
1211
1212         found_obj = NULL;
1213         sgen_los_iterate_objects (find_object_for_ptr_callback, ptr);
1214         if (found_obj)
1215                 return found_obj;
1216
1217         /*
1218          * Very inefficient, but this is debugging code, supposed to
1219          * be called from gdb, so we don't care.
1220          */
1221         found_obj = NULL;
1222         major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, find_object_for_ptr_callback, ptr);
1223         return found_obj;
1224 }
1225
1226 #endif /*HAVE_SGEN_GC*/