mono/metadata/sgen-marksweep.c

   1 /*
   2  * sgen-marksweep.c: Simple generational GC.
   3  *
   4  * Author:
   5  *      Mark Probst <mark.probst@gmail.com>
   6  *
   7  * Copyright 2009-2010 Novell, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * a copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29 #include "config.h"
  30
  31 #ifdef HAVE_SGEN_GC
  32
  33 #include <math.h>
  34 #include <errno.h>
  35
  36 #include "utils/mono-counters.h"
  37 #include "utils/mono-semaphore.h"
  38 #include "utils/mono-time.h"
  39 #include "metadata/object-internals.h"
  40 #include "metadata/profiler-private.h"
  41
  42 #include "metadata/sgen-gc.h"
  43 #include "metadata/sgen-protocol.h"
  44 #include "metadata/sgen-cardtable.h"
  45 #include "metadata/gc-internal.h"
  46
  47 #define MS_BLOCK_SIZE   (16*1024)
  48 #define MS_BLOCK_SIZE_SHIFT     14
  49 #define MAJOR_SECTION_SIZE      MS_BLOCK_SIZE
  50 #define CARDS_PER_BLOCK (MS_BLOCK_SIZE / CARD_SIZE_IN_BYTES)
  51
  52 #ifdef FIXED_HEAP
  53 #define MS_DEFAULT_HEAP_NUM_BLOCKS      (32 * 1024) /* 512 MB */
  54 #endif
  55
  56 /*
  57  * Don't allocate single blocks, but alloc a contingent of this many
  58  * blocks in one swoop.
  59  */
  60 #define MS_BLOCK_ALLOC_NUM      32
  61
  62 /*
  63  * Number of bytes before the first object in a block.  At the start
  64  * of a block is the MSBlockHeader, then opional padding, then come
  65  * the objects, so this must be >= sizeof (MSBlockHeader).
  66  */
  67 #ifdef FIXED_HEAP
  68 #define MS_BLOCK_SKIP   0
  69 #else
  70 #define MS_BLOCK_SKIP   16
  71 #endif
  72
  73 #define MS_BLOCK_FREE   (MS_BLOCK_SIZE - MS_BLOCK_SKIP)
  74
  75 #define MS_NUM_MARK_WORDS       ((MS_BLOCK_SIZE / SGEN_ALLOC_ALIGN + sizeof (mword) * 8 - 1) / (sizeof (mword) * 8))
  76
  77 #if SGEN_MAX_SMALL_OBJ_SIZE > MS_BLOCK_FREE / 2
  78 #error MAX_SMALL_OBJ_SIZE must be at most MS_BLOCK_FREE / 2
  79 #endif
  80
  81 typedef struct _MSBlockInfo MSBlockInfo;
  82 struct _MSBlockInfo {
  83         int obj_size;
  84         int obj_size_index;
  85         int pin_queue_num_entries;
  86         unsigned int pinned : 1;
  87         unsigned int has_references : 1;
  88         unsigned int has_pinned : 1;    /* means cannot evacuate */
  89         unsigned int is_to_space : 1;
  90 #ifdef FIXED_HEAP
  91         unsigned int used : 1;
  92         unsigned int zeroed : 1;
  93 #endif
  94         MSBlockInfo *next;
  95         char *block;
  96         void **free_list;
  97         MSBlockInfo *next_free;
  98         void **pin_queue_start;
  99         mword mark_words [MS_NUM_MARK_WORDS];
 100 };
 101
 102 #ifdef FIXED_HEAP
 103 static int ms_heap_num_blocks = MS_DEFAULT_HEAP_NUM_BLOCKS;
 104
 105 static char *ms_heap_start;
 106 static char *ms_heap_end;
 107
 108 #define MS_PTR_IN_SMALL_MAJOR_HEAP(p)   ((char*)(p) >= ms_heap_start && (char*)(p) < ms_heap_end)
 109
 110 /* array of all all block infos in the system */
 111 static MSBlockInfo *block_infos;
 112 #endif
 113
 114 #define MS_BLOCK_OBJ(b,i)               ((b)->block + MS_BLOCK_SKIP + (b)->obj_size * (i))
 115 #define MS_BLOCK_DATA_FOR_OBJ(o)        ((char*)((mword)(o) & ~(mword)(MS_BLOCK_SIZE - 1)))
 116
 117 #ifdef FIXED_HEAP
 118 #define MS_BLOCK_FOR_OBJ(o)             (&block_infos [(mword)((char*)(o) - ms_heap_start) >> MS_BLOCK_SIZE_SHIFT])
 119 #else
 120 typedef struct {
 121         MSBlockInfo *info;
 122 } MSBlockHeader;
 123
 124 #define MS_BLOCK_FOR_OBJ(o)             (((MSBlockHeader*)MS_BLOCK_DATA_FOR_OBJ ((o)))->info)
 125 #endif
 126
 127 #define MS_BLOCK_OBJ_INDEX(o,b) (((char*)(o) - ((b)->block + MS_BLOCK_SKIP)) / (b)->obj_size)
 128
 129 #define MS_CALC_MARK_BIT(w,b,o)         do {                            \
 130                 int i = ((char*)(o) - MS_BLOCK_DATA_FOR_OBJ ((o))) >> SGEN_ALLOC_ALIGN_BITS; \
 131                 if (sizeof (mword) == 4) {                              \
 132                         (w) = i >> 5;                                   \
 133                         (b) = i & 31;                                   \
 134                 } else {                                                \
 135                         (w) = i >> 6;                                   \
 136                         (b) = i & 63;                                   \
 137                 }                                                       \
 138         } while (0)
 139
 140 #define MS_MARK_BIT(bl,w,b)     ((bl)->mark_words [(w)] & (1L << (b)))
 141 #define MS_SET_MARK_BIT(bl,w,b) ((bl)->mark_words [(w)] |= (1L << (b)))
 142 #define MS_PAR_SET_MARK_BIT(was_marked,bl,w,b)  do {                    \
 143                 mword __old = (bl)->mark_words [(w)];                   \
 144                 mword __bitmask = 1L << (b);                            \
 145                 if (__old & __bitmask) {                                \
 146                         was_marked = TRUE;                              \
 147                         break;                                          \
 148                 }                                                       \
 149                 if (SGEN_CAS_PTR ((gpointer*)&(bl)->mark_words [(w)],   \
 150                                                 (gpointer)(__old | __bitmask), \
 151                                                 (gpointer)__old) ==     \
 152                                 (gpointer)__old) {                      \
 153                         was_marked = FALSE;                             \
 154                         break;                                          \
 155                 }                                                       \
 156         } while (1)
 157
 158 #define MS_OBJ_ALLOCED(o,b)     (*(void**)(o) && (*(char**)(o) < (b)->block || *(char**)(o) >= (b)->block + MS_BLOCK_SIZE))
 159
 160 #define MS_BLOCK_OBJ_SIZE_FACTOR        (sqrt (2.0))
 161
 162 /*
 163  * This way we can lookup block object size indexes for sizes up to
 164  * 256 bytes with a single load.
 165  */
 166 #define MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES      32
 167
 168 static int *block_obj_sizes;
 169 static int num_block_obj_sizes;
 170 static int fast_block_obj_size_indexes [MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES];
 171
 172 #define MS_BLOCK_FLAG_PINNED    1
 173 #define MS_BLOCK_FLAG_REFS      2
 174
 175 #define MS_BLOCK_TYPE_MAX       4
 176
 177 #ifdef SGEN_PARALLEL_MARK
 178 static LOCK_DECLARE (ms_block_list_mutex);
 179 #define LOCK_MS_BLOCK_LIST mono_mutex_lock (&ms_block_list_mutex)
 180 #define UNLOCK_MS_BLOCK_LIST mono_mutex_unlock (&ms_block_list_mutex)
 181 #endif
 182
 183 static gboolean *evacuate_block_obj_sizes;
 184 static float evacuation_threshold = 0.666;
 185
 186 static gboolean concurrent_sweep = FALSE;
 187 static gboolean have_swept;
 188
 189 /* all allocated blocks in the system */
 190 static MSBlockInfo *all_blocks;
 191
 192 #ifdef FIXED_HEAP
 193 /* non-allocated block free-list */
 194 static MSBlockInfo *empty_blocks = NULL;
 195 #else
 196 /* non-allocated block free-list */
 197 static void *empty_blocks = NULL;
 198 static int num_empty_blocks = 0;
 199 #endif
 200
 201 #define FOREACH_BLOCK(bl)       for ((bl) = all_blocks; (bl); (bl) = (bl)->next) {
 202 #define END_FOREACH_BLOCK       }
 203
 204 static int num_major_sections = 0;
 205 /* one free block list for each block object size */
 206 static MSBlockInfo **free_block_lists [MS_BLOCK_TYPE_MAX];
 207
 208 #ifdef SGEN_PARALLEL_MARK
 209 #ifdef HAVE_KW_THREAD
 210 static __thread MSBlockInfo ***workers_free_block_lists;
 211 #else
 212 static MonoNativeTlsKey workers_free_block_lists_key;
 213 #endif
 214 #endif
 215
 216 static long long stat_major_blocks_alloced = 0;
 217 static long long stat_major_blocks_freed = 0;
 218 static long long stat_major_objects_evacuated = 0;
 219 static long long stat_time_wait_for_sweep = 0;
 220 #ifdef SGEN_PARALLEL_MARK
 221 static long long stat_slots_allocated_in_vain = 0;
 222 #endif
 223
 224 static gboolean ms_sweep_in_progress = FALSE;
 225 static MonoNativeThreadId ms_sweep_thread;
 226 static MonoSemType ms_sweep_cmd_semaphore;
 227 static MonoSemType ms_sweep_done_semaphore;
 228
 229 static void
 230 ms_signal_sweep_command (void)
 231 {
 232         if (!concurrent_sweep)
 233                 return;
 234
 235         g_assert (!ms_sweep_in_progress);
 236         ms_sweep_in_progress = TRUE;
 237         MONO_SEM_POST (&ms_sweep_cmd_semaphore);
 238 }
 239
 240 static void
 241 ms_signal_sweep_done (void)
 242 {
 243         if (!concurrent_sweep)
 244                 return;
 245
 246         MONO_SEM_POST (&ms_sweep_done_semaphore);
 247 }
 248
 249 static void
 250 ms_wait_for_sweep_done (void)
 251 {
 252         SGEN_TV_DECLARE (atv);
 253         SGEN_TV_DECLARE (btv);
 254         int result;
 255
 256         if (!concurrent_sweep)
 257                 return;
 258
 259         if (!ms_sweep_in_progress)
 260                 return;
 261
 262         SGEN_TV_GETTIME (atv);
 263         while ((result = MONO_SEM_WAIT (&ms_sweep_done_semaphore)) != 0) {
 264                 if (errno != EINTR)
 265                         g_error ("MONO_SEM_WAIT");
 266         }
 267         SGEN_TV_GETTIME (btv);
 268         stat_time_wait_for_sweep += SGEN_TV_ELAPSED (atv, btv);
 269
 270         g_assert (ms_sweep_in_progress);
 271         ms_sweep_in_progress = FALSE;
 272 }
 273
 274 static int
 275 ms_find_block_obj_size_index (int size)
 276 {
 277         int i;
 278         DEBUG (9, g_assert (size <= SGEN_MAX_SMALL_OBJ_SIZE));
 279         for (i = 0; i < num_block_obj_sizes; ++i)
 280                 if (block_obj_sizes [i] >= size)
 281                         return i;
 282         g_assert_not_reached ();
 283 }
 284
 285 #define FREE_BLOCKS_FROM(lists,p,r)     (lists [((p) ? MS_BLOCK_FLAG_PINNED : 0) | ((r) ? MS_BLOCK_FLAG_REFS : 0)])
 286 #define FREE_BLOCKS(p,r)                (FREE_BLOCKS_FROM (free_block_lists, (p), (r)))
 287 #ifdef SGEN_PARALLEL_MARK
 288 #ifdef HAVE_KW_THREAD
 289 #define FREE_BLOCKS_LOCAL(p,r)          (FREE_BLOCKS_FROM (workers_free_block_lists, (p), (r)))
 290 #else
 291 #define FREE_BLOCKS_LOCAL(p,r)          (FREE_BLOCKS_FROM (((MSBlockInfo***)(mono_native_tls_get_value (workers_free_block_lists_key))), (p), (r)))
 292 #endif
 293 #else
 294 //#define FREE_BLOCKS_LOCAL(p,r)                (FREE_BLOCKS_FROM (free_block_lists, (p), (r)))
 295 #endif
 296
 297 #define MS_BLOCK_OBJ_SIZE_INDEX(s)                              \
 298         (((s)+7)>>3 < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES ?      \
 299          fast_block_obj_size_indexes [((s)+7)>>3] :             \
 300          ms_find_block_obj_size_index ((s)))
 301
 302 #ifdef FIXED_HEAP
 303 static void*
 304 major_alloc_heap (mword nursery_size, mword nursery_align, int the_nursery_bits)
 305 {
 306         char *nursery_start;
 307         mword major_heap_size = ms_heap_num_blocks * MS_BLOCK_SIZE;
 308         mword alloc_size = nursery_size + major_heap_size;
 309         int i;
 310
 311         g_assert (ms_heap_num_blocks > 0);
 312         g_assert (nursery_size % MS_BLOCK_SIZE == 0);
 313         if (nursery_align)
 314                 g_assert (nursery_align % MS_BLOCK_SIZE == 0);
 315
 316         nursery_start = mono_sgen_alloc_os_memory_aligned (alloc_size, nursery_align ? nursery_align : MS_BLOCK_SIZE, TRUE);
 317         ms_heap_start = nursery_start + nursery_size;
 318         ms_heap_end = ms_heap_start + major_heap_size;
 319
 320         block_infos = mono_sgen_alloc_internal_dynamic (sizeof (MSBlockInfo) * ms_heap_num_blocks, INTERNAL_MEM_MS_BLOCK_INFO);
 321
 322         for (i = 0; i < ms_heap_num_blocks; ++i) {
 323                 block_infos [i].block = ms_heap_start + i * MS_BLOCK_SIZE;
 324                 if (i < ms_heap_num_blocks - 1)
 325                         block_infos [i].next_free = &block_infos [i + 1];
 326                 else
 327                         block_infos [i].next_free = NULL;
 328                 block_infos [i].zeroed = TRUE;
 329         }
 330
 331         empty_blocks = &block_infos [0];
 332
 333         return nursery_start;
 334 }
 335 #else
 336 static void*
 337 major_alloc_heap (mword nursery_size, mword nursery_align, int the_nursery_bits)
 338 {
 339         char *start;
 340         if (nursery_align)
 341                 start = mono_sgen_alloc_os_memory_aligned (nursery_size, nursery_align, TRUE);
 342         else
 343                 start = mono_sgen_alloc_os_memory (nursery_size, TRUE);
 344
 345         return start;
 346 }
 347 #endif
 348
 349 static void
 350 update_heap_boundaries_for_block (MSBlockInfo *block)
 351 {
 352         mono_sgen_update_heap_boundaries ((mword)block->block, (mword)block->block + MS_BLOCK_SIZE);
 353 }
 354
 355 #ifdef FIXED_HEAP
 356 static MSBlockInfo*
 357 ms_get_empty_block (void)
 358 {
 359         MSBlockInfo *block;
 360
 361         g_assert (empty_blocks);
 362
 363         do {
 364                 block = empty_blocks;
 365         } while (SGEN_CAS_PTR ((gpointer*)&empty_blocks, block->next_free, block) != block);
 366
 367         block->used = TRUE;
 368
 369         if (!block->zeroed)
 370                 memset (block->block, 0, MS_BLOCK_SIZE);
 371
 372         return block;
 373 }
 374
 375 static void
 376 ms_free_block (MSBlockInfo *block)
 377 {
 378         block->next_free = empty_blocks;
 379         empty_blocks = block;
 380         block->used = FALSE;
 381         block->zeroed = FALSE;
 382         mono_sgen_release_space (MS_BLOCK_SIZE, SPACE_MAJOR);
 383 }
 384 #else
 385 static void*
 386 ms_get_empty_block (void)
 387 {
 388         char *p;
 389         int i;
 390         void *block, *empty, *next;
 391
 392  retry:
 393         if (!empty_blocks) {
 394                 p = mono_sgen_alloc_os_memory_aligned (MS_BLOCK_SIZE * MS_BLOCK_ALLOC_NUM, MS_BLOCK_SIZE, TRUE);
 395
 396                 for (i = 0; i < MS_BLOCK_ALLOC_NUM; ++i) {
 397                         block = p;
 398                         /*
 399                          * We do the free list update one after the
 400                          * other so that other threads can use the new
 401                          * blocks as quickly as possible.
 402                          */
 403                         do {
 404                                 empty = empty_blocks;
 405                                 *(void**)block = empty;
 406                         } while (SGEN_CAS_PTR ((gpointer*)&empty_blocks, block, empty) != empty);
 407                         p += MS_BLOCK_SIZE;
 408                 }
 409
 410                 SGEN_ATOMIC_ADD (num_empty_blocks, MS_BLOCK_ALLOC_NUM);
 411
 412                 stat_major_blocks_alloced += MS_BLOCK_ALLOC_NUM;
 413         }
 414
 415         do {
 416                 empty = empty_blocks;
 417                 if (!empty)
 418                         goto retry;
 419                 block = empty;
 420                 next = *(void**)block;
 421         } while (SGEN_CAS_PTR (&empty_blocks, next, empty) != empty);
 422
 423         SGEN_ATOMIC_ADD (num_empty_blocks, -1);
 424
 425         *(void**)block = NULL;
 426
 427         g_assert (!((mword)block & (MS_BLOCK_SIZE - 1)));
 428
 429         return block;
 430 }
 431
 432 static void
 433 ms_free_block (void *block)
 434 {
 435         void *empty;
 436
 437         mono_sgen_release_space (MS_BLOCK_SIZE, SPACE_MAJOR);
 438         memset (block, 0, MS_BLOCK_SIZE);
 439
 440         do {
 441                 empty = empty_blocks;
 442                 *(void**)block = empty;
 443         } while (SGEN_CAS_PTR (&empty_blocks, block, empty) != empty);
 444
 445         SGEN_ATOMIC_ADD (num_empty_blocks, 1);
 446 }
 447 #endif
 448
 449 //#define MARKSWEEP_CONSISTENCY_CHECK
 450
 451 #ifdef MARKSWEEP_CONSISTENCY_CHECK
 452 static void
 453 check_block_free_list (MSBlockInfo *block, int size, gboolean pinned)
 454 {
 455         MSBlockInfo *b;
 456
 457         for (; block; block = block->next_free) {
 458                 g_assert (block->obj_size == size);
 459                 g_assert ((pinned && block->pinned) || (!pinned && !block->pinned));
 460
 461                 /* blocks in the free lists must have at least
 462                    one free slot */
 463                 g_assert (block->free_list);
 464
 465 #ifdef FIXED_HEAP
 466                 /* the block must not be in the empty_blocks list */
 467                 for (b = empty_blocks; b; b = b->next_free)
 468                         g_assert (b != block);
 469 #endif
 470                 /* the block must be in the all_blocks list */
 471                 for (b = all_blocks; b; b = b->next) {
 472                         if (b == block)
 473                                 break;
 474                 }
 475                 g_assert (b == block);
 476         }
 477 }
 478
 479 static void
 480 check_empty_blocks (void)
 481 {
 482 #ifndef FIXED_HEAP
 483         void *p;
 484         int i = 0;
 485         for (p = empty_blocks; p; p = *(void**)p)
 486                 ++i;
 487         g_assert (i == num_empty_blocks);
 488 #endif
 489 }
 490
 491 static void
 492 consistency_check (void)
 493 {
 494         MSBlockInfo *block;
 495         int i;
 496
 497         /* check all blocks */
 498         FOREACH_BLOCK (block) {
 499                 int count = MS_BLOCK_FREE / block->obj_size;
 500                 int num_free = 0;
 501                 void **free;
 502
 503 #ifndef FIXED_HEAP
 504                 /* check block header */
 505                 g_assert (((MSBlockHeader*)block->block)->info == block);
 506 #endif
 507
 508                 /* count number of free slots */
 509                 for (i = 0; i < count; ++i) {
 510                         void **obj = (void**) MS_BLOCK_OBJ (block, i);
 511                         if (!MS_OBJ_ALLOCED (obj, block))
 512                                 ++num_free;
 513                 }
 514
 515                 /* check free list */
 516                 for (free = block->free_list; free; free = (void**)*free) {
 517                         g_assert (MS_BLOCK_FOR_OBJ (free) == block);
 518                         --num_free;
 519                 }
 520                 g_assert (num_free == 0);
 521
 522                 /* check all mark words are zero */
 523                 for (i = 0; i < MS_NUM_MARK_WORDS; ++i)
 524                         g_assert (block->mark_words [i] == 0);
 525         } END_FOREACH_BLOCK;
 526
 527         /* check free blocks */
 528         for (i = 0; i < num_block_obj_sizes; ++i) {
 529                 int j;
 530                 for (j = 0; j < MS_BLOCK_TYPE_MAX; ++j)
 531                         check_block_free_list (free_block_lists [j][i], block_obj_sizes [i], j & MS_BLOCK_FLAG_PINNED);
 532         }
 533
 534         check_empty_blocks ();
 535 }
 536 #endif
 537
 538 static gboolean
 539 ms_alloc_block (int size_index, gboolean pinned, gboolean has_references)
 540 {
 541         int size = block_obj_sizes [size_index];
 542         int count = MS_BLOCK_FREE / size;
 543         MSBlockInfo *info;
 544 #ifdef SGEN_PARALLEL_MARK
 545         MSBlockInfo *next;
 546 #endif
 547 #ifndef FIXED_HEAP
 548         MSBlockHeader *header;
 549 #endif
 550         MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
 551         char *obj_start;
 552         int i;
 553
 554         if (!mono_sgen_try_alloc_space (MS_BLOCK_SIZE, SPACE_MAJOR))
 555                 return FALSE;
 556
 557 #ifdef FIXED_HEAP
 558         info = ms_get_empty_block ();
 559 #else
 560         info = mono_sgen_alloc_internal (INTERNAL_MEM_MS_BLOCK_INFO);
 561 #endif
 562
 563         DEBUG (9, g_assert (count >= 2));
 564
 565         info->obj_size = size;
 566         info->obj_size_index = size_index;
 567         info->pinned = pinned;
 568         info->has_references = has_references;
 569         info->has_pinned = pinned;
 570         info->is_to_space = (mono_sgen_get_current_collection_generation () == GENERATION_OLD);
 571 #ifndef FIXED_HEAP
 572         info->block = ms_get_empty_block ();
 573
 574         header = (MSBlockHeader*) info->block;
 575         header->info = info;
 576 #endif
 577
 578         update_heap_boundaries_for_block (info);
 579
 580         /* build free list */
 581         obj_start = info->block + MS_BLOCK_SKIP;
 582         info->free_list = (void**)obj_start;
 583         /* we're skipping the last one - it must be nulled */
 584         for (i = 0; i < count - 1; ++i) {
 585                 char *next_obj_start = obj_start + size;
 586                 *(void**)obj_start = next_obj_start;
 587                 obj_start = next_obj_start;
 588         }
 589         /* the last one */
 590         *(void**)obj_start = NULL;
 591
 592 #ifdef SGEN_PARALLEL_MARK
 593         do {
 594                 next = info->next_free = free_blocks [size_index];
 595         } while (SGEN_CAS_PTR ((void**)&free_blocks [size_index], info, next) != next);
 596
 597         do {
 598                 next = info->next = all_blocks;
 599         } while (SGEN_CAS_PTR ((void**)&all_blocks, info, next) != next);
 600 #else
 601         info->next_free = free_blocks [size_index];
 602         free_blocks [size_index] = info;
 603
 604         info->next = all_blocks;
 605         all_blocks = info;
 606 #endif
 607
 608         ++num_major_sections;
 609         return TRUE;
 610 }
 611
 612 static gboolean
 613 obj_is_from_pinned_alloc (char *ptr)
 614 {
 615         MSBlockInfo *block;
 616
 617         FOREACH_BLOCK (block) {
 618                 if (ptr >= block->block && ptr <= block->block + MS_BLOCK_SIZE)
 619                         return block->pinned;
 620         } END_FOREACH_BLOCK;
 621         return FALSE;
 622 }
 623
 624 static void*
 625 unlink_slot_from_free_list_uncontested (MSBlockInfo **free_blocks, int size_index)
 626 {
 627         MSBlockInfo *block;
 628         void *obj;
 629
 630         block = free_blocks [size_index];
 631         DEBUG (9, g_assert (block));
 632
 633         obj = block->free_list;
 634         DEBUG (9, g_assert (obj));
 635
 636         block->free_list = *(void**)obj;
 637         if (!block->free_list) {
 638                 free_blocks [size_index] = block->next_free;
 639                 block->next_free = NULL;
 640         }
 641
 642         return obj;
 643 }
 644
 645 #ifdef SGEN_PARALLEL_MARK
 646 static gboolean
 647 try_remove_block_from_free_list (MSBlockInfo *block, MSBlockInfo **free_blocks, int size_index)
 648 {
 649         /*
 650          * No more free slots in the block, so try to free the block.
 651          * Don't try again if we don't succeed - another thread will
 652          * already have done it.
 653          */
 654         MSBlockInfo *next_block = block->next_free;
 655         if (SGEN_CAS_PTR ((void**)&free_blocks [size_index], next_block, block) == block) {
 656                 /*
 657                 void *old = SGEN_CAS_PTR ((void**)&block->next_free, NULL, next_block);
 658                 g_assert (old == next_block);
 659                 */
 660                 block->next_free = NULL;
 661                 return TRUE;
 662         }
 663         return FALSE;
 664 }
 665
 666 static void*
 667 alloc_obj_par (int size, gboolean pinned, gboolean has_references)
 668 {
 669         int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 670         MSBlockInfo **free_blocks_local = FREE_BLOCKS_LOCAL (pinned, has_references);
 671         MSBlockInfo *block;
 672         void *obj;
 673
 674         DEBUG (9, g_assert (!ms_sweep_in_progress));
 675         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
 676
 677         if (free_blocks_local [size_index]) {
 678         get_slot:
 679                 obj = unlink_slot_from_free_list_uncontested (free_blocks_local, size_index);
 680         } else {
 681                 MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
 682
 683         get_block:
 684                 block = free_blocks [size_index];
 685                 if (block) {
 686                         if (!try_remove_block_from_free_list (block, free_blocks, size_index))
 687                                 goto get_block;
 688
 689                         g_assert (block->next_free == NULL);
 690                         g_assert (block->free_list);
 691                         block->next_free = free_blocks_local [size_index];
 692                         free_blocks_local [size_index] = block;
 693
 694                         goto get_slot;
 695                 } else {
 696                         gboolean success;
 697
 698                         LOCK_MS_BLOCK_LIST;
 699                         success = ms_alloc_block (size_index, pinned, has_references);
 700                         UNLOCK_MS_BLOCK_LIST;
 701
 702                         if (G_UNLIKELY (!success))
 703                                 return NULL;
 704
 705                         goto get_block;
 706                 }
 707         }
 708
 709         /*
 710          * FIXME: This should not be necessary because it'll be
 711          * overwritten by the vtable immediately.
 712          */
 713         *(void**)obj = NULL;
 714
 715         return obj;
 716 }
 717
 718 static void*
 719 major_par_alloc_object (int size, gboolean has_references)
 720 {
 721         return alloc_obj_par (size, FALSE, has_references);
 722 }
 723 #endif
 724
 725 static void*
 726 alloc_obj (int size, gboolean pinned, gboolean has_references)
 727 {
 728         int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 729         MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
 730         void *obj;
 731
 732 #ifdef SGEN_PARALLEL_MARK
 733         DEBUG (9, g_assert (current_collection_generation != GENERATION_OLD));
 734 #endif
 735
 736         DEBUG (9, g_assert (!ms_sweep_in_progress));
 737
 738         if (!free_blocks [size_index]) {
 739                 if (G_UNLIKELY (!ms_alloc_block (size_index, pinned, has_references)))
 740                         return NULL;
 741         }
 742
 743         obj = unlink_slot_from_free_list_uncontested (free_blocks, size_index);
 744
 745         /*
 746          * FIXME: This should not be necessary because it'll be
 747          * overwritten by the vtable immediately.
 748          */
 749         *(void**)obj = NULL;
 750
 751         return obj;
 752 }
 753
 754 static void*
 755 major_alloc_object (int size, gboolean has_references)
 756 {
 757         return alloc_obj (size, FALSE, has_references);
 758 }
 759
 760 /*
 761  * We're not freeing the block if it's empty.  We leave that work for
 762  * the next major collection.
 763  *
 764  * This is just called from the domain clearing code, which runs in a
 765  * single thread and has the GC lock, so we don't need an extra lock.
 766  */
 767 static void
 768 free_object (char *obj, size_t size, gboolean pinned)
 769 {
 770         MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
 771         int word, bit;
 772         DEBUG (9, g_assert ((pinned && block->pinned) || (!pinned && !block->pinned)));
 773         DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
 774         MS_CALC_MARK_BIT (word, bit, obj);
 775         DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
 776         if (!block->free_list) {
 777                 MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, block->has_references);
 778                 int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 779                 DEBUG (9, g_assert (!block->next_free));
 780                 block->next_free = free_blocks [size_index];
 781                 free_blocks [size_index] = block;
 782         }
 783         memset (obj, 0, size);
 784         *(void**)obj = block->free_list;
 785         block->free_list = (void**)obj;
 786 }
 787
 788 static void
 789 major_free_non_pinned_object (char *obj, size_t size)
 790 {
 791         free_object (obj, size, FALSE);
 792 }
 793
 794 /* size is a multiple of SGEN_ALLOC_ALIGN */
 795 static void*
 796 major_alloc_small_pinned_obj (size_t size, gboolean has_references)
 797 {
 798         void *res;
 799
 800         ms_wait_for_sweep_done ();
 801
 802         res = alloc_obj (size, TRUE, has_references);
 803          /*If we failed to alloc memory, we better try releasing memory
 804           *as pinned alloc is requested by the runtime.
 805           */
 806          if (!res) {
 807                  sgen_collect_major_no_lock ("pinned alloc failure");
 808                  res = alloc_obj (size, TRUE, has_references);
 809          }
 810          return res;
 811 }
 812
 813 static void
 814 free_pinned_object (char *obj, size_t size)
 815 {
 816         free_object (obj, size, TRUE);
 817 }
 818
 819 /*
 820  * size is already rounded up and we hold the GC lock.
 821  */
 822 static void*
 823 major_alloc_degraded (MonoVTable *vtable, size_t size)
 824 {
 825         void *obj;
 826         int old_num_sections;
 827
 828         ms_wait_for_sweep_done ();
 829
 830         old_num_sections = num_major_sections;
 831
 832         obj = alloc_obj (size, FALSE, SGEN_VTABLE_HAS_REFERENCES (vtable));
 833         if (G_LIKELY (obj)) {
 834                 *(MonoVTable**)obj = vtable;
 835                 HEAVY_STAT (++stat_objects_alloced_degraded);
 836                 HEAVY_STAT (stat_bytes_alloced_degraded += size);
 837                 g_assert (num_major_sections >= old_num_sections);
 838                 mono_sgen_register_major_sections_alloced (num_major_sections - old_num_sections);
 839         }
 840         return obj;
 841 }
 842
 843 #define MAJOR_OBJ_IS_IN_TO_SPACE(obj)   FALSE
 844
 845 /*
 846  * obj is some object.  If it's not in the major heap (i.e. if it's in
 847  * the nursery or LOS), return FALSE.  Otherwise return whether it's
 848  * been marked or copied.
 849  */
 850 static gboolean
 851 major_is_object_live (char *obj)
 852 {
 853         MSBlockInfo *block;
 854         int word, bit;
 855 #ifndef FIXED_HEAP
 856         mword objsize;
 857 #endif
 858
 859         if (mono_sgen_ptr_in_nursery (obj))
 860                 return FALSE;
 861
 862 #ifdef FIXED_HEAP
 863         /* LOS */
 864         if (!MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
 865                 return FALSE;
 866 #else
 867         objsize = SGEN_ALIGN_UP (mono_sgen_safe_object_get_size ((MonoObject*)obj));
 868
 869         /* LOS */
 870         if (objsize > SGEN_MAX_SMALL_OBJ_SIZE)
 871                 return FALSE;
 872 #endif
 873
 874         /* now we know it's in a major block */
 875         block = MS_BLOCK_FOR_OBJ (obj);
 876         DEBUG (9, g_assert (!block->pinned));
 877         MS_CALC_MARK_BIT (word, bit, obj);
 878         return MS_MARK_BIT (block, word, bit) ? TRUE : FALSE;
 879 }
 880
 881 static gboolean
 882 major_ptr_is_in_non_pinned_space (char *ptr)
 883 {
 884         MSBlockInfo *block;
 885
 886         FOREACH_BLOCK (block) {
 887                 if (ptr >= block->block && ptr <= block->block + MS_BLOCK_SIZE)
 888                         return !block->pinned;
 889         } END_FOREACH_BLOCK;
 890         return FALSE;
 891 }
 892
 893 static void
 894 major_iterate_objects (gboolean non_pinned, gboolean pinned, IterateObjectCallbackFunc callback, void *data)
 895 {
 896         MSBlockInfo *block;
 897
 898         ms_wait_for_sweep_done ();
 899
 900         FOREACH_BLOCK (block) {
 901                 int count = MS_BLOCK_FREE / block->obj_size;
 902                 int i;
 903
 904                 if (block->pinned && !pinned)
 905                         continue;
 906                 if (!block->pinned && !non_pinned)
 907                         continue;
 908
 909                 for (i = 0; i < count; ++i) {
 910                         void **obj = (void**) MS_BLOCK_OBJ (block, i);
 911                         if (MS_OBJ_ALLOCED (obj, block))
 912                                 callback ((char*)obj, block->obj_size, data);
 913                 }
 914         } END_FOREACH_BLOCK;
 915 }
 916
 917 static void
 918 major_check_scan_starts (void)
 919 {
 920 }
 921
 922 static void
 923 major_dump_heap (FILE *heap_dump_file)
 924 {
 925         MSBlockInfo *block;
 926         int *slots_available = alloca (sizeof (int) * num_block_obj_sizes);
 927         int *slots_used = alloca (sizeof (int) * num_block_obj_sizes);
 928         int i;
 929
 930         for (i = 0; i < num_block_obj_sizes; ++i)
 931                 slots_available [i] = slots_used [i] = 0;
 932
 933         FOREACH_BLOCK (block) {
 934                 int index = ms_find_block_obj_size_index (block->obj_size);
 935                 int count = MS_BLOCK_FREE / block->obj_size;
 936
 937                 slots_available [index] += count;
 938                 for (i = 0; i < count; ++i) {
 939                         if (MS_OBJ_ALLOCED (MS_BLOCK_OBJ (block, i), block))
 940                                 ++slots_used [index];
 941                 }
 942         } END_FOREACH_BLOCK;
 943
 944         fprintf (heap_dump_file, "<occupancies>\n");
 945         for (i = 0; i < num_block_obj_sizes; ++i) {
 946                 fprintf (heap_dump_file, "<occupancy size=\"%d\" available=\"%d\" used=\"%d\" />\n",
 947                                 block_obj_sizes [i], slots_available [i], slots_used [i]);
 948         }
 949         fprintf (heap_dump_file, "</occupancies>\n");
 950
 951         FOREACH_BLOCK (block) {
 952                 int count = MS_BLOCK_FREE / block->obj_size;
 953                 int i;
 954                 int start = -1;
 955
 956                 fprintf (heap_dump_file, "<section type=\"%s\" size=\"%zu\">\n", "old", (size_t)MS_BLOCK_FREE);
 957
 958                 for (i = 0; i <= count; ++i) {
 959                         if ((i < count) && MS_OBJ_ALLOCED (MS_BLOCK_OBJ (block, i), block)) {
 960                                 if (start < 0)
 961                                         start = i;
 962                         } else {
 963                                 if (start >= 0) {
 964                                         mono_sgen_dump_occupied (MS_BLOCK_OBJ (block, start), MS_BLOCK_OBJ (block, i), block->block);
 965                                         start = -1;
 966                                 }
 967                         }
 968                 }
 969
 970                 fprintf (heap_dump_file, "</section>\n");
 971         } END_FOREACH_BLOCK;
 972 }
 973
 974 #define LOAD_VTABLE     SGEN_LOAD_VTABLE
 975
 976 #define MS_MARK_OBJECT_AND_ENQUEUE_CHECKED(obj,block,queue) do {        \
 977                 int __word, __bit;                                      \
 978                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 979                 if (!MS_MARK_BIT ((block), __word, __bit) && MS_OBJ_ALLOCED ((obj), (block))) { \
 980                         MS_SET_MARK_BIT ((block), __word, __bit);       \
 981                         if ((block)->has_references)                    \
 982                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 983                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 984                 }                                                       \
 985         } while (0)
 986 #define MS_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do {                \
 987                 int __word, __bit;                                      \
 988                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 989                 DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block))));  \
 990                 if (!MS_MARK_BIT ((block), __word, __bit)) {            \
 991                         MS_SET_MARK_BIT ((block), __word, __bit);       \
 992                         if ((block)->has_references)                    \
 993                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 994                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 995                 }                                                       \
 996         } while (0)
 997 #define MS_PAR_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do {            \
 998                 int __word, __bit;                                      \
 999                 gboolean __was_marked;                                  \
1000                 DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block))));  \
1001                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
1002                 MS_PAR_SET_MARK_BIT (__was_marked, (block), __word, __bit); \
1003                 if (!__was_marked) {                                    \
1004                         if ((block)->has_references)                    \
1005                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
1006                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
1007                 }                                                       \
1008         } while (0)
1009
1010 static void
1011 pin_major_object (void *obj, SgenGrayQueue *queue)
1012 {
1013         MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
1014         block->has_pinned = TRUE;
1015         MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1016 }
1017
1018 #ifdef SGEN_PARALLEL_MARK
1019 static void
1020 pin_or_update_par (void **ptr, void *obj, MonoVTable *vt, SgenGrayQueue *queue)
1021 {
1022         for (;;) {
1023                 mword vtable_word;
1024                 gboolean major_pinned = FALSE;
1025
1026                 if (mono_sgen_ptr_in_nursery (obj)) {
1027                         if (SGEN_CAS_PTR (obj, (void*)((mword)vt | SGEN_PINNED_BIT), vt) == vt) {
1028                                 mono_sgen_pin_object (obj, queue);
1029                                 break;
1030                         }
1031                 } else {
1032                         pin_major_object (obj, queue);
1033                         major_pinned = TRUE;
1034                 }
1035
1036                 vtable_word = *(mword*)obj;
1037                 /*someone else forwarded it, update the pointer and bail out*/
1038                 if (vtable_word & SGEN_FORWARDED_BIT) {
1039                         *ptr = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1040                         break;
1041                 }
1042
1043                 /*someone pinned it, nothing to do.*/
1044                 if (vtable_word & SGEN_PINNED_BIT || major_pinned)
1045                         break;
1046         }
1047 }
1048 #endif
1049
1050 #include "sgen-major-copy-object.h"
1051
1052 #ifdef SGEN_PARALLEL_MARK
1053 static void
1054 major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
1055 {
1056         void *obj = *ptr;
1057         mword objsize;
1058         MSBlockInfo *block;
1059         MonoVTable *vt;
1060
1061         HEAVY_STAT (++stat_copy_object_called_major);
1062
1063         DEBUG (9, g_assert (obj));
1064         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
1065
1066         if (mono_sgen_ptr_in_nursery (obj)) {
1067                 int word, bit;
1068                 gboolean has_references;
1069                 void *destination;
1070                 mword vtable_word = *(mword*)obj;
1071                 vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1072
1073                 if (vtable_word & SGEN_FORWARDED_BIT) {
1074                         *ptr = (void*)vt;
1075                         return;
1076                 }
1077
1078                 if (vtable_word & SGEN_PINNED_BIT)
1079                         return;
1080
1081                 HEAVY_STAT (++stat_objects_copied_major);
1082
1083         do_copy_object:
1084                 objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
1085                 has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
1086
1087                 destination = alloc_obj_par (objsize, FALSE, has_references);
1088                 if (G_UNLIKELY (!destination)) {
1089                         if (!mono_sgen_ptr_in_nursery (obj)) {
1090                                 int size_index;
1091                                 block = MS_BLOCK_FOR_OBJ (obj);
1092                                 size_index = block->obj_size_index;
1093                                 evacuate_block_obj_sizes [size_index] = FALSE;
1094                         }
1095
1096                         pin_or_update_par (ptr, obj, vt, queue);
1097                         mono_sgen_set_pinned_from_failed_allocation (objsize);
1098                         return;
1099                 }
1100
1101                 /*
1102                  * We do this before the CAS because we want to make
1103                  * sure that if another thread sees the destination
1104                  * pointer the VTable is already in place.  Not doing
1105                  * this can crash binary protocols.
1106                  */
1107                 *(MonoVTable**)destination = vt;
1108
1109                 if (SGEN_CAS_PTR (obj, (void*)((mword)destination | SGEN_FORWARDED_BIT), vt) == vt) {
1110                         gboolean was_marked;
1111
1112                         par_copy_object_no_checks (destination, vt, obj, objsize, has_references ? queue : NULL);
1113                         obj = destination;
1114                         *ptr = obj;
1115
1116                         /*
1117                          * FIXME: If we make major_alloc_object() give
1118                          * us the block info, too, we won't have to
1119                          * re-fetch it here.
1120                          */
1121                         block = MS_BLOCK_FOR_OBJ (obj);
1122                         MS_CALC_MARK_BIT (word, bit, obj);
1123                         DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
1124                         MS_PAR_SET_MARK_BIT (was_marked, block, word, bit);
1125                 } else {
1126                         /*
1127                          * FIXME: We have allocated destination, but
1128                          * we cannot use it.  Give it back to the
1129                          * allocator.
1130                          */
1131                         *(void**)destination = NULL;
1132
1133                         vtable_word = *(mword*)obj;
1134                         g_assert (vtable_word & SGEN_FORWARDED_BIT);
1135
1136                         obj = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1137
1138                         *ptr = obj;
1139
1140                         ++stat_slots_allocated_in_vain;
1141                 }
1142         } else {
1143 #ifdef FIXED_HEAP
1144                 if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
1145 #else
1146                 mword vtable_word = *(mword*)obj;
1147                 vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1148
1149                 /* see comment in the non-parallel version below */
1150                 if (vtable_word & SGEN_FORWARDED_BIT) {
1151                         *ptr = (void*)vt;
1152                         return;
1153                 }
1154                 objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
1155
1156                 if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
1157 #endif
1158                 {
1159                         int size_index;
1160
1161                         block = MS_BLOCK_FOR_OBJ (obj);
1162                         size_index = block->obj_size_index;
1163
1164                         if (!block->has_pinned && evacuate_block_obj_sizes [size_index]) {
1165                                 if (block->is_to_space)
1166                                         return;
1167
1168 #ifdef FIXED_HEAP
1169                                 {
1170                                         mword vtable_word = *(mword*)obj;
1171                                         vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1172
1173                                         if (vtable_word & SGEN_FORWARDED_BIT) {
1174                                                 *ptr = (void*)vt;
1175                                                 return;
1176                                         }
1177                                 }
1178 #endif
1179
1180                                 HEAVY_STAT (++stat_major_objects_evacuated);
1181                                 goto do_copy_object;
1182                         }
1183
1184                         MS_PAR_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1185                 } else {
1186 #ifdef FIXED_HEAP
1187                         mword vtable_word = *(mword*)obj;
1188                         vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1189 #endif
1190
1191                         if (vtable_word & SGEN_PINNED_BIT)
1192                                 return;
1193                         binary_protocol_pin (obj, vt, mono_sgen_safe_object_get_size ((MonoObject*)obj));
1194                         if (SGEN_CAS_PTR (obj, (void*)(vtable_word | SGEN_PINNED_BIT), (void*)vtable_word) == (void*)vtable_word) {
1195                                 if (SGEN_VTABLE_HAS_REFERENCES (vt))
1196                                         GRAY_OBJECT_ENQUEUE (queue, obj);
1197                         } else {
1198                                 g_assert (SGEN_OBJECT_IS_PINNED (obj));
1199                         }
1200                 }
1201         }
1202 }
1203 #else
1204 static void
1205 major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
1206 {
1207         void *obj = *ptr;
1208         MSBlockInfo *block;
1209
1210         HEAVY_STAT (++stat_copy_object_called_major);
1211
1212         DEBUG (9, g_assert (obj));
1213         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
1214
1215         if (mono_sgen_ptr_in_nursery (obj)) {
1216                 int word, bit;
1217                 char *forwarded, *old_obj;
1218
1219                 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
1220                         *ptr = forwarded;
1221                         return;
1222                 }
1223                 if (SGEN_OBJECT_IS_PINNED (obj))
1224                         return;
1225
1226                 HEAVY_STAT (++stat_objects_copied_major);
1227
1228         do_copy_object:
1229                 old_obj = obj;
1230                 obj = copy_object_no_checks (obj, queue);
1231                 if (G_UNLIKELY (old_obj == obj)) {
1232                         /*If we fail to evacuate an object we just stop doing it for a given block size as all other will surely fail too.*/
1233                         if (!mono_sgen_ptr_in_nursery (obj)) {
1234                                 int size_index;
1235                                 block = MS_BLOCK_FOR_OBJ (obj);
1236                                 size_index = block->obj_size_index;
1237                                 evacuate_block_obj_sizes [size_index] = FALSE;
1238                                 MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1239                         }
1240                         return;
1241                 }
1242                 *ptr = obj;
1243
1244                 /*
1245                  * FIXME: See comment for copy_object_no_checks().  If
1246                  * we have that, we can let the allocation function
1247                  * give us the block info, too, and we won't have to
1248                  * re-fetch it.
1249                  */
1250                 block = MS_BLOCK_FOR_OBJ (obj);
1251                 MS_CALC_MARK_BIT (word, bit, obj);
1252                 DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
1253                 MS_SET_MARK_BIT (block, word, bit);
1254         } else {
1255                 char *forwarded;
1256 #ifdef FIXED_HEAP
1257                 if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
1258 #else
1259                 mword objsize;
1260
1261                 /*
1262                  * If we have don't have a fixed heap we cannot know
1263                  * whether an object is in the LOS or in the small
1264                  * object major heap without checking its size.  To do
1265                  * that, however, we need to know that we actually
1266                  * have a valid object, not a forwarding pointer, so
1267                  * we have to do this check first.
1268                  */
1269                 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
1270                         *ptr = forwarded;
1271                         return;
1272                 }
1273
1274                 objsize = SGEN_ALIGN_UP (mono_sgen_safe_object_get_size ((MonoObject*)obj));
1275
1276                 if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
1277 #endif
1278                 {
1279                         int size_index;
1280                         gboolean evacuate;
1281
1282                         block = MS_BLOCK_FOR_OBJ (obj);
1283                         size_index = block->obj_size_index;
1284                         evacuate = evacuate_block_obj_sizes [size_index];
1285
1286 #ifdef FIXED_HEAP
1287                         /*
1288                          * We could also check for !block->has_pinned
1289                          * here, but it would only make an uncommon case
1290                          * faster, namely objects that are in blocks
1291                          * whose slot sizes are evacuated but which have
1292                          * pinned objects.
1293                          */
1294                         if (evacuate && (forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
1295                                 *ptr = forwarded;
1296                                 return;
1297                         }
1298 #endif
1299
1300                         if (evacuate && !block->has_pinned) {
1301                                 g_assert (!SGEN_OBJECT_IS_PINNED (obj));
1302                                 if (block->is_to_space)
1303                                         return;
1304                                 HEAVY_STAT (++stat_major_objects_evacuated);
1305                                 goto do_copy_object;
1306                         } else {
1307                                 MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1308                         }
1309                 } else {
1310                         if (SGEN_OBJECT_IS_PINNED (obj))
1311                                 return;
1312                         binary_protocol_pin (obj, (gpointer)SGEN_LOAD_VTABLE (obj), mono_sgen_safe_object_get_size ((MonoObject*)obj));
1313                         SGEN_PIN_OBJECT (obj);
1314                         /* FIXME: only enqueue if object has references */
1315                         GRAY_OBJECT_ENQUEUE (queue, obj);
1316                 }
1317         }
1318 }
1319 #endif
1320
1321 #include "sgen-major-scan-object.h"
1322
1323 static void
1324 mark_pinned_objects_in_block (MSBlockInfo *block, SgenGrayQueue *queue)
1325 {
1326         int i;
1327         int last_index = -1;
1328
1329         if (!block->pin_queue_num_entries)
1330                 return;
1331
1332         block->has_pinned = TRUE;
1333
1334         for (i = 0; i < block->pin_queue_num_entries; ++i) {
1335                 int index = MS_BLOCK_OBJ_INDEX (block->pin_queue_start [i], block);
1336                 DEBUG (9, g_assert (index >= 0 && index < MS_BLOCK_FREE / block->obj_size));
1337                 if (index == last_index)
1338                         continue;
1339                 MS_MARK_OBJECT_AND_ENQUEUE_CHECKED (MS_BLOCK_OBJ (block, index), block, queue);
1340                 last_index = index;
1341         }
1342 }
1343
1344 static void
1345 ms_sweep (void)
1346 {
1347         int i;
1348         MSBlockInfo **iter;
1349
1350         /* statistics for evacuation */
1351         int *slots_available = alloca (sizeof (int) * num_block_obj_sizes);
1352         int *slots_used = alloca (sizeof (int) * num_block_obj_sizes);
1353         int *num_blocks = alloca (sizeof (int) * num_block_obj_sizes);
1354
1355         for (i = 0; i < num_block_obj_sizes; ++i)
1356                 slots_available [i] = slots_used [i] = num_blocks [i] = 0;
1357
1358         /* clear all the free lists */
1359         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
1360                 MSBlockInfo **free_blocks = free_block_lists [i];
1361                 int j;
1362                 for (j = 0; j < num_block_obj_sizes; ++j)
1363                         free_blocks [j] = NULL;
1364         }
1365
1366         /* traverse all blocks, free and zero unmarked objects */
1367         iter = &all_blocks;
1368         while (*iter) {
1369                 MSBlockInfo *block = *iter;
1370                 int count;
1371                 gboolean have_live = FALSE;
1372                 gboolean has_pinned;
1373                 int obj_index;
1374                 int obj_size_index;
1375
1376                 obj_size_index = block->obj_size_index;
1377
1378                 has_pinned = block->has_pinned;
1379                 block->has_pinned = block->pinned;
1380
1381                 block->is_to_space = FALSE;
1382
1383                 count = MS_BLOCK_FREE / block->obj_size;
1384                 block->free_list = NULL;
1385
1386                 for (obj_index = 0; obj_index < count; ++obj_index) {
1387                         int word, bit;
1388                         void *obj = MS_BLOCK_OBJ (block, obj_index);
1389
1390                         MS_CALC_MARK_BIT (word, bit, obj);
1391                         if (MS_MARK_BIT (block, word, bit)) {
1392                                 DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
1393                                 have_live = TRUE;
1394                                 if (!has_pinned)
1395                                         ++slots_used [obj_size_index];
1396                         } else {
1397                                 /* an unmarked object */
1398                                 if (MS_OBJ_ALLOCED (obj, block)) {
1399                                         binary_protocol_empty (obj, block->obj_size);
1400                                         memset (obj, 0, block->obj_size);
1401                                 }
1402                                 *(void**)obj = block->free_list;
1403                                 block->free_list = obj;
1404                         }
1405                 }
1406
1407                 /* reset mark bits */
1408                 memset (block->mark_words, 0, sizeof (mword) * MS_NUM_MARK_WORDS);
1409
1410                 /*
1411                  * FIXME: reverse free list so that it's in address
1412                  * order
1413                  */
1414
1415                 if (have_live) {
1416                         if (!has_pinned) {
1417                                 ++num_blocks [obj_size_index];
1418                                 slots_available [obj_size_index] += count;
1419                         }
1420
1421                         iter = &block->next;
1422
1423                         /*
1424                          * If there are free slots in the block, add
1425                          * the block to the corresponding free list.
1426                          */
1427                         if (block->free_list) {
1428                                 MSBlockInfo **free_blocks = FREE_BLOCKS (block->pinned, block->has_references);
1429                                 int index = MS_BLOCK_OBJ_SIZE_INDEX (block->obj_size);
1430                                 block->next_free = free_blocks [index];
1431                                 free_blocks [index] = block;
1432                         }
1433
1434                         update_heap_boundaries_for_block (block);
1435                 } else {
1436                         /*
1437                          * Blocks without live objects are removed from the
1438                          * block list and freed.
1439                          */
1440                         *iter = block->next;
1441
1442 #ifdef FIXED_HEAP
1443                         ms_free_block (block);
1444 #else
1445                         ms_free_block (block->block);
1446
1447                         mono_sgen_free_internal (block, INTERNAL_MEM_MS_BLOCK_INFO);
1448 #endif
1449
1450                         --num_major_sections;
1451                 }
1452         }
1453
1454         for (i = 0; i < num_block_obj_sizes; ++i) {
1455                 float usage = (float)slots_used [i] / (float)slots_available [i];
1456                 if (num_blocks [i] > 5 && usage < evacuation_threshold) {
1457                         evacuate_block_obj_sizes [i] = TRUE;
1458                         /*
1459                         g_print ("slot size %d - %d of %d used\n",
1460                                         block_obj_sizes [i], slots_used [i], slots_available [i]);
1461                         */
1462                 } else {
1463                         evacuate_block_obj_sizes [i] = FALSE;
1464                 }
1465         }
1466
1467         have_swept = TRUE;
1468 }
1469
1470 static mono_native_thread_return_t
1471 ms_sweep_thread_func (void *dummy)
1472 {
1473         g_assert (concurrent_sweep);
1474
1475         for (;;) {
1476                 int result;
1477
1478                 while ((result = MONO_SEM_WAIT (&ms_sweep_cmd_semaphore)) != 0) {
1479                         if (errno != EINTR)
1480                                 g_error ("MONO_SEM_WAIT");
1481                 }
1482
1483                 ms_sweep ();
1484
1485                 ms_signal_sweep_done ();
1486         }
1487
1488         return NULL;
1489 }
1490
1491 static void
1492 major_sweep (void)
1493 {
1494         if (concurrent_sweep) {
1495                 g_assert (ms_sweep_thread);
1496                 ms_signal_sweep_command ();
1497         } else {
1498                 ms_sweep ();
1499         }
1500 }
1501
1502 static int count_pinned_ref;
1503 static int count_pinned_nonref;
1504 static int count_nonpinned_ref;
1505 static int count_nonpinned_nonref;
1506
1507 static void
1508 count_nonpinned_callback (char *obj, size_t size, void *data)
1509 {
1510         MonoVTable *vtable = (MonoVTable*)LOAD_VTABLE (obj);
1511
1512         if (vtable->klass->has_references)
1513                 ++count_nonpinned_ref;
1514         else
1515                 ++count_nonpinned_nonref;
1516 }
1517
1518 static void
1519 count_pinned_callback (char *obj, size_t size, void *data)
1520 {
1521         MonoVTable *vtable = (MonoVTable*)LOAD_VTABLE (obj);
1522
1523         if (vtable->klass->has_references)
1524                 ++count_pinned_ref;
1525         else
1526                 ++count_pinned_nonref;
1527 }
1528
1529 static void __attribute__ ((unused))
1530 count_ref_nonref_objs (void)
1531 {
1532         int total;
1533
1534         count_pinned_ref = 0;
1535         count_pinned_nonref = 0;
1536         count_nonpinned_ref = 0;
1537         count_nonpinned_nonref = 0;
1538
1539         major_iterate_objects (TRUE, FALSE, count_nonpinned_callback, NULL);
1540         major_iterate_objects (FALSE, TRUE, count_pinned_callback, NULL);
1541
1542         total = count_pinned_nonref + count_nonpinned_nonref + count_pinned_ref + count_nonpinned_ref;
1543
1544         g_print ("ref: %d pinned %d non-pinned   non-ref: %d pinned %d non-pinned  --  %.1f\n",
1545                         count_pinned_ref, count_nonpinned_ref,
1546                         count_pinned_nonref, count_nonpinned_nonref,
1547                         (count_pinned_nonref + count_nonpinned_nonref) * 100.0 / total);
1548 }
1549
1550 static int
1551 ms_calculate_block_obj_sizes (double factor, int *arr)
1552 {
1553         double target_size = sizeof (MonoObject);
1554         int num_sizes = 0;
1555         int last_size = 0;
1556
1557         do {
1558                 int target_count = ceil (MS_BLOCK_FREE / target_size);
1559                 int size = MIN ((MS_BLOCK_FREE / target_count) & ~(SGEN_ALLOC_ALIGN - 1), SGEN_MAX_SMALL_OBJ_SIZE);
1560
1561                 if (size != last_size) {
1562                         if (arr)
1563                                 arr [num_sizes] = size;
1564                         ++num_sizes;
1565                         last_size = size;
1566                 }
1567
1568                 target_size *= factor;
1569         } while (last_size < SGEN_MAX_SMALL_OBJ_SIZE);
1570
1571         return num_sizes;
1572 }
1573
1574 /* only valid during minor collections */
1575 static int old_num_major_sections;
1576
1577 static void
1578 major_start_nursery_collection (void)
1579 {
1580         ms_wait_for_sweep_done ();
1581
1582 #ifdef MARKSWEEP_CONSISTENCY_CHECK
1583         consistency_check ();
1584 #endif
1585
1586         old_num_major_sections = num_major_sections;
1587 }
1588
1589 static void
1590 major_finish_nursery_collection (void)
1591 {
1592 #ifdef MARKSWEEP_CONSISTENCY_CHECK
1593         consistency_check ();
1594 #endif
1595         mono_sgen_register_major_sections_alloced (num_major_sections - old_num_major_sections);
1596 }
1597
1598 static void
1599 major_start_major_collection (void)
1600 {
1601         int i;
1602
1603         ms_wait_for_sweep_done ();
1604
1605         /* clear the free lists */
1606         for (i = 0; i < num_block_obj_sizes; ++i) {
1607                 if (!evacuate_block_obj_sizes [i])
1608                         continue;
1609
1610                 free_block_lists [0][i] = NULL;
1611                 free_block_lists [MS_BLOCK_FLAG_REFS][i] = NULL;
1612         }
1613 }
1614
1615 static void
1616 major_finish_major_collection (void)
1617 {
1618 }
1619
1620 static void
1621 major_have_computer_minor_collection_allowance (void)
1622 {
1623 #ifndef FIXED_HEAP
1624         int section_reserve = mono_sgen_get_minor_collection_allowance () / MS_BLOCK_SIZE;
1625
1626         g_assert (have_swept);
1627         ms_wait_for_sweep_done ();
1628         g_assert (!ms_sweep_in_progress);
1629
1630         /*
1631          * FIXME: We don't free blocks on 32 bit platforms because it
1632          * can lead to address space fragmentation, since we're
1633          * allocating blocks in larger contingents.
1634          */
1635         if (sizeof (mword) < 8)
1636                 return;
1637
1638         while (num_empty_blocks > section_reserve) {
1639                 void *next = *(void**)empty_blocks;
1640                 mono_sgen_free_os_memory (empty_blocks, MS_BLOCK_SIZE);
1641                 empty_blocks = next;
1642                 /*
1643                  * Needs not be atomic because this is running
1644                  * single-threaded.
1645                  */
1646                 --num_empty_blocks;
1647
1648                 ++stat_major_blocks_freed;
1649         }
1650 #endif
1651 }
1652
1653 static void
1654 major_find_pin_queue_start_ends (SgenGrayQueue *queue)
1655 {
1656         MSBlockInfo *block;
1657
1658         FOREACH_BLOCK (block) {
1659                 block->pin_queue_start = mono_sgen_find_optimized_pin_queue_area (block->block + MS_BLOCK_SKIP, block->block + MS_BLOCK_SIZE,
1660                                 &block->pin_queue_num_entries);
1661         } END_FOREACH_BLOCK;
1662 }
1663
1664 static void
1665 major_pin_objects (SgenGrayQueue *queue)
1666 {
1667         MSBlockInfo *block;
1668
1669         FOREACH_BLOCK (block) {
1670                 mark_pinned_objects_in_block (block, queue);
1671         } END_FOREACH_BLOCK;
1672 }
1673
1674 static void
1675 major_init_to_space (void)
1676 {
1677 }
1678
1679 static void
1680 major_report_pinned_memory_usage (void)
1681 {
1682         g_assert_not_reached ();
1683 }
1684
1685 static gint64
1686 major_get_used_size (void)
1687 {
1688         gint64 size = 0;
1689         MSBlockInfo *block;
1690
1691         FOREACH_BLOCK (block) {
1692                 int count = MS_BLOCK_FREE / block->obj_size;
1693                 void **iter;
1694                 size += count * block->obj_size;
1695                 for (iter = block->free_list; iter; iter = (void**)*iter)
1696                         size -= block->obj_size;
1697         } END_FOREACH_BLOCK;
1698
1699         return size;
1700 }
1701
1702 static int
1703 get_num_major_sections (void)
1704 {
1705         return num_major_sections;
1706 }
1707
1708 static gboolean
1709 major_handle_gc_param (const char *opt)
1710 {
1711 #ifdef FIXED_HEAP
1712         if (g_str_has_prefix (opt, "major-heap-size=")) {
1713                 const char *arg = strchr (opt, '=') + 1;
1714                 glong size;
1715                 if (!mono_gc_parse_environment_string_extract_number (arg, &size))
1716                         return FALSE;
1717                 ms_heap_num_blocks = (size + MS_BLOCK_SIZE - 1) / MS_BLOCK_SIZE;
1718                 g_assert (ms_heap_num_blocks > 0);
1719                 return TRUE;
1720         } else
1721 #endif
1722         if (g_str_has_prefix (opt, "evacuation-threshold=")) {
1723                 const char *arg = strchr (opt, '=') + 1;
1724                 int percentage = atoi (arg);
1725                 if (percentage < 0 || percentage > 100) {
1726                         fprintf (stderr, "evacuation-threshold must be an integer in the range 0-100.\n");
1727                         exit (1);
1728                 }
1729                 evacuation_threshold = (float)percentage / 100.0;
1730                 return TRUE;
1731         } else if (!strcmp (opt, "concurrent-sweep")) {
1732                 concurrent_sweep = TRUE;
1733                 return TRUE;
1734         } else if (!strcmp (opt, "no-concurrent-sweep")) {
1735                 concurrent_sweep = FALSE;
1736                 return TRUE;
1737         }
1738
1739         return FALSE;
1740 }
1741
1742 static void
1743 major_print_gc_param_usage (void)
1744 {
1745         fprintf (stderr,
1746                         ""
1747 #ifdef FIXED_HEAP
1748                         "  major-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n"
1749 #endif
1750                         "  evacuation-threshold=P (where P is a percentage, an integer in 0-100)\n"
1751                         "  (no-)concurrent-sweep\n"
1752                         );
1753 }
1754
1755 #ifdef SGEN_HAVE_CARDTABLE
1756 static void
1757 major_iterate_live_block_ranges (sgen_cardtable_block_callback callback)
1758 {
1759         MSBlockInfo *block;
1760
1761         FOREACH_BLOCK (block) {
1762                 if (block->has_references)
1763                         callback ((mword)block->block, MS_BLOCK_SIZE);
1764         } END_FOREACH_BLOCK;
1765 }
1766
1767 #ifdef HEAVY_STATISTICS
1768 extern long long marked_cards;
1769 extern long long scanned_cards;
1770 extern long long scanned_objects;
1771 extern long long remarked_cards;
1772 #endif
1773
1774 #define CARD_WORDS_PER_BLOCK (CARDS_PER_BLOCK / SIZEOF_VOID_P)
1775 /*
1776  * MS blocks are 16K aligned.
1777  * Cardtables are 4K aligned, at least.
1778  * This means that the cardtable of a given block is 32 bytes aligned.
1779  */
1780 static guint8*
1781 initial_skip_card (guint8 *card_data)
1782 {
1783         mword *cards = (mword*)card_data;
1784         mword card;
1785         int i;
1786         for (i = 0; i < CARD_WORDS_PER_BLOCK; ++i) {
1787                 card = cards [i];
1788                 if (card)
1789                         break;
1790         }
1791
1792         if (i == CARD_WORDS_PER_BLOCK)
1793                 return card_data + CARDS_PER_BLOCK;
1794
1795 #if defined(__i386__) && defined(__GNUC__)
1796         return card_data + i * 4 +  (__builtin_ffs (card) - 1) / 8;
1797 #elif defined(__x86_64__) && defined(__GNUC__)
1798         return card_data + i * 8 +  (__builtin_ffsll (card) - 1) / 8;
1799 #elif defined(__s390x__) && defined(__GNUC__)
1800         return card_data + i * 8 +  (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1801 #else
1802         for (i = i * SIZEOF_VOID_P; i < CARDS_PER_BLOCK; ++i) {
1803                 if (card_data [i])
1804                         return &card_data [i];
1805         }
1806         return card_data;
1807 #endif
1808 }
1809
1810
1811 static G_GNUC_UNUSED guint8*
1812 skip_card (guint8 *card_data, guint8 *card_data_end)
1813 {
1814         while (card_data < card_data_end && !*card_data)
1815                 ++card_data;
1816         return card_data;
1817 }
1818
1819 #define MS_BLOCK_OBJ_INDEX_FAST(o,b,os) (((char*)(o) - ((b) + MS_BLOCK_SKIP)) / (os))
1820 #define MS_BLOCK_OBJ_FAST(b,os,i)                       ((b) + MS_BLOCK_SKIP + (os) * (i))
1821 #define MS_OBJ_ALLOCED_FAST(o,b)                (*(void**)(o) && (*(char**)(o) < (b) || *(char**)(o) >= (b) + MS_BLOCK_SIZE))
1822
1823 static void
1824 major_scan_card_table (SgenGrayQueue *queue)
1825 {
1826         MSBlockInfo *block;
1827
1828         FOREACH_BLOCK (block) {
1829                 int block_obj_size;
1830                 char *block_start;
1831
1832                 if (!block->has_references)
1833                         continue;
1834
1835                 block_obj_size = block->obj_size;
1836                 block_start = block->block;
1837
1838                 if (block_obj_size >= CARD_SIZE_IN_BYTES) {
1839                         guint8 *cards;
1840 #ifndef SGEN_HAVE_OVERLAPPING_CARDS
1841                         guint8 cards_data [CARDS_PER_BLOCK];
1842 #endif
1843                         char *obj, *end, *base;
1844
1845                         /*We can avoid the extra copy since the remark cardtable was cleaned before */
1846 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1847                         cards = sgen_card_table_get_card_scan_address ((mword)block_start);
1848 #else
1849                         cards = cards_data;
1850                         if (!sgen_card_table_get_card_data (cards_data, (mword)block_start, CARDS_PER_BLOCK))
1851                                 continue;
1852 #endif
1853
1854                         obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, 0);
1855                         end = block_start + MS_BLOCK_SIZE;
1856                         base = sgen_card_table_align_pointer (obj);
1857
1858                         while (obj < end) {
1859                                 if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
1860                                         int card_offset = (obj - base) >> CARD_BITS;
1861                                         sgen_cardtable_scan_object (obj, block_obj_size, cards + card_offset, queue);
1862                                 }
1863                                 obj += block_obj_size;
1864                         }
1865                 } else {
1866                         ScanObjectFunc scan_func = mono_sgen_get_minor_scan_object ();
1867                         guint8 *card_data, *card_base;
1868                         guint8 *card_data_end;
1869
1870                         /*
1871                          * This is safe in face of card aliasing for the following reason:
1872                          *
1873                          * Major blocks are 16k aligned, or 32 cards aligned.
1874                          * Cards aliasing happens in powers of two, so as long as major blocks are aligned to their
1875                          * sizes, they won't overflow the cardtable overlap modulus.
1876                          */
1877                         card_data = card_base = sgen_card_table_get_card_scan_address ((mword)block_start);
1878                         card_data_end = card_data + CARDS_PER_BLOCK;
1879
1880                         for (card_data = initial_skip_card (card_data); card_data < card_data_end; ++card_data) { //card_data = skip_card (card_data + 1, card_data_end)) {
1881                                 int index;
1882                                 int idx = card_data - card_base;
1883                                 char *start = (char*)(block_start + idx * CARD_SIZE_IN_BYTES);
1884                                 char *end = start + CARD_SIZE_IN_BYTES;
1885                                 char *obj;
1886
1887                                 HEAVY_STAT (++scanned_cards);
1888
1889                                 if (!*card_data)
1890                                         continue;
1891
1892                                 HEAVY_STAT (++marked_cards);
1893
1894                                 sgen_card_table_prepare_card_for_scanning (card_data);
1895
1896                                 if (idx == 0)
1897                                         index = 0;
1898                                 else
1899                                         index = MS_BLOCK_OBJ_INDEX_FAST (start, block_start, block_obj_size);
1900
1901                                 obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, index);
1902                                 while (obj < end) {
1903                                         if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
1904                                                 HEAVY_STAT (++scanned_objects);
1905                                                 scan_func (obj, queue);
1906                                         }
1907                                         obj += block_obj_size;
1908                                 }
1909                                 HEAVY_STAT (if (*card_data) ++remarked_cards);
1910                         }
1911                 }
1912         } END_FOREACH_BLOCK;
1913 }
1914 #endif
1915
1916 static gboolean
1917 major_is_worker_thread (MonoNativeThreadId thread)
1918 {
1919         if (concurrent_sweep)
1920                 return thread == ms_sweep_thread;
1921         else
1922                 return FALSE;
1923 }
1924
1925 static void
1926 alloc_free_block_lists (MSBlockInfo ***lists)
1927 {
1928         int i;
1929         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i)
1930                 lists [i] = mono_sgen_alloc_internal_dynamic (sizeof (MSBlockInfo*) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
1931 }
1932
1933 #ifdef SGEN_PARALLEL_MARK
1934 static void*
1935 major_alloc_worker_data (void)
1936 {
1937         /* FIXME: free this when the workers come down */
1938         MSBlockInfo ***lists = malloc (sizeof (MSBlockInfo**) * MS_BLOCK_TYPE_MAX);
1939         alloc_free_block_lists (lists);
1940         return lists;
1941 }
1942
1943 static void
1944 major_init_worker_thread (void *data)
1945 {
1946         MSBlockInfo ***lists = data;
1947         int i;
1948
1949         g_assert (lists && lists != free_block_lists);
1950         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
1951                 int j;
1952                 for (j = 0; j < num_block_obj_sizes; ++j)
1953                         g_assert (!lists [i][j]);
1954         }
1955
1956 #ifdef HAVE_KW_THREAD
1957         workers_free_block_lists = data;
1958 #else
1959         mono_native_tls_set_value (workers_free_block_lists_key, data);
1960 #endif
1961 }
1962
1963 static void
1964 major_reset_worker_data (void *data)
1965 {
1966         MSBlockInfo ***lists = data;
1967         int i;
1968         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
1969                 int j;
1970                 for (j = 0; j < num_block_obj_sizes; ++j)
1971                         lists [i][j] = NULL;
1972         }
1973 }
1974 #endif
1975
1976 #undef pthread_create
1977
1978 static void
1979 post_param_init (void)
1980 {
1981         if (concurrent_sweep) {
1982                 if (mono_native_thread_create (&ms_sweep_thread, ms_sweep_thread_func, NULL)) {
1983                         fprintf (stderr, "Error: Could not create sweep thread.\n");
1984                         exit (1);
1985                 }
1986         }
1987 }
1988
1989 void
1990 #ifdef SGEN_PARALLEL_MARK
1991 #ifdef FIXED_HEAP
1992 mono_sgen_marksweep_fixed_par_init
1993 #else
1994 mono_sgen_marksweep_par_init
1995 #endif
1996 #else
1997 #ifdef FIXED_HEAP
1998 mono_sgen_marksweep_fixed_init
1999 #else
2000 mono_sgen_marksweep_init
2001 #endif
2002 #endif
2003         (SgenMajorCollector *collector)
2004 {
2005         int i;
2006
2007 #ifndef FIXED_HEAP
2008         mono_sgen_register_fixed_internal_mem_type (INTERNAL_MEM_MS_BLOCK_INFO, sizeof (MSBlockInfo));
2009 #endif
2010
2011         num_block_obj_sizes = ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, NULL);
2012         block_obj_sizes = mono_sgen_alloc_internal_dynamic (sizeof (int) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
2013         ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, block_obj_sizes);
2014
2015         evacuate_block_obj_sizes = mono_sgen_alloc_internal_dynamic (sizeof (gboolean) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
2016         for (i = 0; i < num_block_obj_sizes; ++i)
2017                 evacuate_block_obj_sizes [i] = FALSE;
2018
2019         /*
2020         {
2021                 int i;
2022                 g_print ("block object sizes:\n");
2023                 for (i = 0; i < num_block_obj_sizes; ++i)
2024                         g_print ("%d\n", block_obj_sizes [i]);
2025         }
2026         */
2027
2028         alloc_free_block_lists (free_block_lists);
2029
2030         for (i = 0; i < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES; ++i)
2031                 fast_block_obj_size_indexes [i] = ms_find_block_obj_size_index (i * 8);
2032         for (i = 0; i < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES * 8; ++i)
2033                 g_assert (MS_BLOCK_OBJ_SIZE_INDEX (i) == ms_find_block_obj_size_index (i));
2034
2035 #ifdef SGEN_PARALLEL_MARK
2036         LOCK_INIT (ms_block_list_mutex);
2037 #endif
2038
2039         mono_counters_register ("# major blocks allocated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_alloced);
2040         mono_counters_register ("# major blocks freed", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_freed);
2041         mono_counters_register ("# major objects evacuated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_objects_evacuated);
2042         mono_counters_register ("Wait for sweep time", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &stat_time_wait_for_sweep);
2043 #ifdef SGEN_PARALLEL_MARK
2044         mono_counters_register ("Slots allocated in vain", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_slots_allocated_in_vain);
2045
2046 #ifndef HAVE_KW_THREAD
2047         mono_native_tls_alloc (&workers_free_block_lists_key, NULL);
2048 #endif
2049 #endif
2050
2051         /*
2052          * FIXME: These are superfluous if concurrent sweep is
2053          * disabled.  We might want to create them lazily.
2054          */
2055         MONO_SEM_INIT (&ms_sweep_cmd_semaphore, 0);
2056         MONO_SEM_INIT (&ms_sweep_done_semaphore, 0);
2057
2058         collector->section_size = MAJOR_SECTION_SIZE;
2059 #ifdef SGEN_PARALLEL_MARK
2060         collector->is_parallel = TRUE;
2061         collector->alloc_worker_data = major_alloc_worker_data;
2062         collector->init_worker_thread = major_init_worker_thread;
2063         collector->reset_worker_data = major_reset_worker_data;
2064 #else
2065         collector->is_parallel = FALSE;
2066 #endif
2067         collector->supports_cardtable = TRUE;
2068
2069         collector->have_swept = &have_swept;
2070
2071         collector->alloc_heap = major_alloc_heap;
2072         collector->is_object_live = major_is_object_live;
2073         collector->alloc_small_pinned_obj = major_alloc_small_pinned_obj;
2074         collector->alloc_degraded = major_alloc_degraded;
2075         collector->copy_or_mark_object = major_copy_or_mark_object;
2076         collector->alloc_object = major_alloc_object;
2077 #ifdef SGEN_PARALLEL_MARK
2078         collector->par_alloc_object = major_par_alloc_object;
2079 #endif
2080         collector->free_pinned_object = free_pinned_object;
2081         collector->iterate_objects = major_iterate_objects;
2082         collector->free_non_pinned_object = major_free_non_pinned_object;
2083         collector->find_pin_queue_start_ends = major_find_pin_queue_start_ends;
2084         collector->pin_objects = major_pin_objects;
2085 #ifdef SGEN_HAVE_CARDTABLE
2086         collector->scan_card_table = major_scan_card_table;
2087         collector->iterate_live_block_ranges = (void*)(void*) major_iterate_live_block_ranges;
2088 #endif
2089         collector->init_to_space = major_init_to_space;
2090         collector->sweep = major_sweep;
2091         collector->check_scan_starts = major_check_scan_starts;
2092         collector->dump_heap = major_dump_heap;
2093         collector->get_used_size = major_get_used_size;
2094         collector->start_nursery_collection = major_start_nursery_collection;
2095         collector->finish_nursery_collection = major_finish_nursery_collection;
2096         collector->start_major_collection = major_start_major_collection;
2097         collector->finish_major_collection = major_finish_major_collection;
2098         collector->have_computed_minor_collection_allowance = major_have_computer_minor_collection_allowance;
2099         collector->ptr_is_in_non_pinned_space = major_ptr_is_in_non_pinned_space;
2100         collector->obj_is_from_pinned_alloc = obj_is_from_pinned_alloc;
2101         collector->report_pinned_memory_usage = major_report_pinned_memory_usage;
2102         collector->get_num_major_sections = get_num_major_sections;
2103         collector->handle_gc_param = major_handle_gc_param;
2104         collector->print_gc_param_usage = major_print_gc_param_usage;
2105         collector->is_worker_thread = major_is_worker_thread;
2106         collector->post_param_init = post_param_init;
2107
2108         FILL_COLLECTOR_COPY_OBJECT (collector);
2109         FILL_COLLECTOR_SCAN_OBJECT (collector);
2110
2111 #ifdef SGEN_HAVE_CARDTABLE
2112         /*cardtable requires major pages to be 8 cards aligned*/
2113         g_assert ((MS_BLOCK_SIZE % (8 * CARD_SIZE_IN_BYTES)) == 0);
2114 #endif
2115 }
2116
2117 #endif