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 #endif
 718
 719 static void*
 720 alloc_obj (int size, gboolean pinned, gboolean has_references)
 721 {
 722         int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 723         MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
 724         void *obj;
 725
 726 #ifdef SGEN_PARALLEL_MARK
 727         DEBUG (9, g_assert (current_collection_generation != GENERATION_OLD));
 728 #endif
 729
 730         DEBUG (9, g_assert (!ms_sweep_in_progress));
 731
 732         if (!free_blocks [size_index]) {
 733                 if (G_UNLIKELY (!ms_alloc_block (size_index, pinned, has_references)))
 734                         return NULL;
 735         }
 736
 737         obj = unlink_slot_from_free_list_uncontested (free_blocks, size_index);
 738
 739         /*
 740          * FIXME: This should not be necessary because it'll be
 741          * overwritten by the vtable immediately.
 742          */
 743         *(void**)obj = NULL;
 744
 745         return obj;
 746 }
 747
 748 static void*
 749 major_alloc_object (int size, gboolean has_references)
 750 {
 751         return alloc_obj (size, FALSE, has_references);
 752 }
 753
 754 /*
 755  * We're not freeing the block if it's empty.  We leave that work for
 756  * the next major collection.
 757  *
 758  * This is just called from the domain clearing code, which runs in a
 759  * single thread and has the GC lock, so we don't need an extra lock.
 760  */
 761 static void
 762 free_object (char *obj, size_t size, gboolean pinned)
 763 {
 764         MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
 765         int word, bit;
 766         DEBUG (9, g_assert ((pinned && block->pinned) || (!pinned && !block->pinned)));
 767         DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
 768         MS_CALC_MARK_BIT (word, bit, obj);
 769         DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
 770         if (!block->free_list) {
 771                 MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, block->has_references);
 772                 int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 773                 DEBUG (9, g_assert (!block->next_free));
 774                 block->next_free = free_blocks [size_index];
 775                 free_blocks [size_index] = block;
 776         }
 777         memset (obj, 0, size);
 778         *(void**)obj = block->free_list;
 779         block->free_list = (void**)obj;
 780 }
 781
 782 static void
 783 major_free_non_pinned_object (char *obj, size_t size)
 784 {
 785         free_object (obj, size, FALSE);
 786 }
 787
 788 /* size is a multiple of SGEN_ALLOC_ALIGN */
 789 static void*
 790 major_alloc_small_pinned_obj (size_t size, gboolean has_references)
 791 {
 792         void *res;
 793
 794         ms_wait_for_sweep_done ();
 795
 796         res = alloc_obj (size, TRUE, has_references);
 797          /*If we failed to alloc memory, we better try releasing memory
 798           *as pinned alloc is requested by the runtime.
 799           */
 800          if (!res) {
 801                  sgen_collect_major_no_lock ("pinned alloc failure");
 802                  res = alloc_obj (size, TRUE, has_references);
 803          }
 804          return res;
 805 }
 806
 807 static void
 808 free_pinned_object (char *obj, size_t size)
 809 {
 810         free_object (obj, size, TRUE);
 811 }
 812
 813 /*
 814  * size is already rounded up and we hold the GC lock.
 815  */
 816 static void*
 817 major_alloc_degraded (MonoVTable *vtable, size_t size)
 818 {
 819         void *obj;
 820         int old_num_sections;
 821
 822         ms_wait_for_sweep_done ();
 823
 824         old_num_sections = num_major_sections;
 825
 826         obj = alloc_obj (size, FALSE, SGEN_VTABLE_HAS_REFERENCES (vtable));
 827         if (G_LIKELY (obj)) {
 828                 *(MonoVTable**)obj = vtable;
 829                 HEAVY_STAT (++stat_objects_alloced_degraded);
 830                 HEAVY_STAT (stat_bytes_alloced_degraded += size);
 831                 g_assert (num_major_sections >= old_num_sections);
 832                 mono_sgen_register_major_sections_alloced (num_major_sections - old_num_sections);
 833         }
 834         return obj;
 835 }
 836
 837 #define MAJOR_OBJ_IS_IN_TO_SPACE(obj)   FALSE
 838
 839 /*
 840  * obj is some object.  If it's not in the major heap (i.e. if it's in
 841  * the nursery or LOS), return FALSE.  Otherwise return whether it's
 842  * been marked or copied.
 843  */
 844 static gboolean
 845 major_is_object_live (char *obj)
 846 {
 847         MSBlockInfo *block;
 848         int word, bit;
 849 #ifndef FIXED_HEAP
 850         mword objsize;
 851 #endif
 852
 853         if (mono_sgen_ptr_in_nursery (obj))
 854                 return FALSE;
 855
 856 #ifdef FIXED_HEAP
 857         /* LOS */
 858         if (!MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
 859                 return FALSE;
 860 #else
 861         objsize = SGEN_ALIGN_UP (mono_sgen_safe_object_get_size ((MonoObject*)obj));
 862
 863         /* LOS */
 864         if (objsize > SGEN_MAX_SMALL_OBJ_SIZE)
 865                 return FALSE;
 866 #endif
 867
 868         /* now we know it's in a major block */
 869         block = MS_BLOCK_FOR_OBJ (obj);
 870         DEBUG (9, g_assert (!block->pinned));
 871         MS_CALC_MARK_BIT (word, bit, obj);
 872         return MS_MARK_BIT (block, word, bit) ? TRUE : FALSE;
 873 }
 874
 875 static gboolean
 876 major_ptr_is_in_non_pinned_space (char *ptr)
 877 {
 878         MSBlockInfo *block;
 879
 880         FOREACH_BLOCK (block) {
 881                 if (ptr >= block->block && ptr <= block->block + MS_BLOCK_SIZE)
 882                         return !block->pinned;
 883         } END_FOREACH_BLOCK;
 884         return FALSE;
 885 }
 886
 887 static void
 888 major_iterate_objects (gboolean non_pinned, gboolean pinned, IterateObjectCallbackFunc callback, void *data)
 889 {
 890         MSBlockInfo *block;
 891
 892         ms_wait_for_sweep_done ();
 893
 894         FOREACH_BLOCK (block) {
 895                 int count = MS_BLOCK_FREE / block->obj_size;
 896                 int i;
 897
 898                 if (block->pinned && !pinned)
 899                         continue;
 900                 if (!block->pinned && !non_pinned)
 901                         continue;
 902
 903                 for (i = 0; i < count; ++i) {
 904                         void **obj = (void**) MS_BLOCK_OBJ (block, i);
 905                         if (MS_OBJ_ALLOCED (obj, block))
 906                                 callback ((char*)obj, block->obj_size, data);
 907                 }
 908         } END_FOREACH_BLOCK;
 909 }
 910
 911 static void
 912 major_check_scan_starts (void)
 913 {
 914 }
 915
 916 static void
 917 major_dump_heap (FILE *heap_dump_file)
 918 {
 919         MSBlockInfo *block;
 920         int *slots_available = alloca (sizeof (int) * num_block_obj_sizes);
 921         int *slots_used = alloca (sizeof (int) * num_block_obj_sizes);
 922         int i;
 923
 924         for (i = 0; i < num_block_obj_sizes; ++i)
 925                 slots_available [i] = slots_used [i] = 0;
 926
 927         FOREACH_BLOCK (block) {
 928                 int index = ms_find_block_obj_size_index (block->obj_size);
 929                 int count = MS_BLOCK_FREE / block->obj_size;
 930
 931                 slots_available [index] += count;
 932                 for (i = 0; i < count; ++i) {
 933                         if (MS_OBJ_ALLOCED (MS_BLOCK_OBJ (block, i), block))
 934                                 ++slots_used [index];
 935                 }
 936         } END_FOREACH_BLOCK;
 937
 938         fprintf (heap_dump_file, "<occupancies>\n");
 939         for (i = 0; i < num_block_obj_sizes; ++i) {
 940                 fprintf (heap_dump_file, "<occupancy size=\"%d\" available=\"%d\" used=\"%d\" />\n",
 941                                 block_obj_sizes [i], slots_available [i], slots_used [i]);
 942         }
 943         fprintf (heap_dump_file, "</occupancies>\n");
 944
 945         FOREACH_BLOCK (block) {
 946                 int count = MS_BLOCK_FREE / block->obj_size;
 947                 int i;
 948                 int start = -1;
 949
 950                 fprintf (heap_dump_file, "<section type=\"%s\" size=\"%zu\">\n", "old", (size_t)MS_BLOCK_FREE);
 951
 952                 for (i = 0; i <= count; ++i) {
 953                         if ((i < count) && MS_OBJ_ALLOCED (MS_BLOCK_OBJ (block, i), block)) {
 954                                 if (start < 0)
 955                                         start = i;
 956                         } else {
 957                                 if (start >= 0) {
 958                                         mono_sgen_dump_occupied (MS_BLOCK_OBJ (block, start), MS_BLOCK_OBJ (block, i), block->block);
 959                                         start = -1;
 960                                 }
 961                         }
 962                 }
 963
 964                 fprintf (heap_dump_file, "</section>\n");
 965         } END_FOREACH_BLOCK;
 966 }
 967
 968 #define LOAD_VTABLE     SGEN_LOAD_VTABLE
 969
 970 #define MS_MARK_OBJECT_AND_ENQUEUE_CHECKED(obj,block,queue) do {        \
 971                 int __word, __bit;                                      \
 972                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 973                 if (!MS_MARK_BIT ((block), __word, __bit) && MS_OBJ_ALLOCED ((obj), (block))) { \
 974                         MS_SET_MARK_BIT ((block), __word, __bit);       \
 975                         if ((block)->has_references)                    \
 976                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 977                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 978                 }                                                       \
 979         } while (0)
 980 #define MS_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do {                \
 981                 int __word, __bit;                                      \
 982                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 983                 DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block))));  \
 984                 if (!MS_MARK_BIT ((block), __word, __bit)) {            \
 985                         MS_SET_MARK_BIT ((block), __word, __bit);       \
 986                         if ((block)->has_references)                    \
 987                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 988                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 989                 }                                                       \
 990         } while (0)
 991 #define MS_PAR_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do {            \
 992                 int __word, __bit;                                      \
 993                 gboolean __was_marked;                                  \
 994                 DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block))));  \
 995                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 996                 MS_PAR_SET_MARK_BIT (__was_marked, (block), __word, __bit); \
 997                 if (!__was_marked) {                                    \
 998                         if ((block)->has_references)                    \
 999                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
1000                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
1001                 }                                                       \
1002         } while (0)
1003
1004 static void
1005 pin_major_object (void *obj, SgenGrayQueue *queue)
1006 {
1007         MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
1008         block->has_pinned = TRUE;
1009         MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1010 }
1011
1012 #ifdef SGEN_PARALLEL_MARK
1013 static void
1014 pin_or_update_par (void **ptr, void *obj, MonoVTable *vt, SgenGrayQueue *queue)
1015 {
1016         for (;;) {
1017                 mword vtable_word;
1018                 gboolean major_pinned = FALSE;
1019
1020                 if (mono_sgen_ptr_in_nursery (obj)) {
1021                         if (SGEN_CAS_PTR (obj, (void*)((mword)vt | SGEN_PINNED_BIT), vt) == vt) {
1022                                 mono_sgen_pin_object (obj, queue);
1023                                 break;
1024                         }
1025                 } else {
1026                         pin_major_object (obj, queue);
1027                         major_pinned = TRUE;
1028                 }
1029
1030                 vtable_word = *(mword*)obj;
1031                 /*someone else forwarded it, update the pointer and bail out*/
1032                 if (vtable_word & SGEN_FORWARDED_BIT) {
1033                         *ptr = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1034                         break;
1035                 }
1036
1037                 /*someone pinned it, nothing to do.*/
1038                 if (vtable_word & SGEN_PINNED_BIT || major_pinned)
1039                         break;
1040         }
1041 }
1042 #endif
1043
1044 #include "sgen-major-copy-object.h"
1045
1046 #ifdef SGEN_PARALLEL_MARK
1047 static void
1048 major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
1049 {
1050         void *obj = *ptr;
1051         mword objsize;
1052         MSBlockInfo *block;
1053         MonoVTable *vt;
1054
1055         HEAVY_STAT (++stat_copy_object_called_major);
1056
1057         DEBUG (9, g_assert (obj));
1058         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
1059
1060         if (mono_sgen_ptr_in_nursery (obj)) {
1061                 int word, bit;
1062                 gboolean has_references;
1063                 void *destination;
1064                 mword vtable_word = *(mword*)obj;
1065                 vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1066
1067                 if (vtable_word & SGEN_FORWARDED_BIT) {
1068                         *ptr = (void*)vt;
1069                         return;
1070                 }
1071
1072                 if (vtable_word & SGEN_PINNED_BIT)
1073                         return;
1074
1075                 HEAVY_STAT (++stat_objects_copied_major);
1076
1077         do_copy_object:
1078                 objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
1079                 has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
1080
1081                 destination = alloc_obj_par (objsize, FALSE, has_references);
1082                 if (G_UNLIKELY (!destination)) {
1083                         if (!mono_sgen_ptr_in_nursery (obj)) {
1084                                 int size_index;
1085                                 block = MS_BLOCK_FOR_OBJ (obj);
1086                                 size_index = block->obj_size_index;
1087                                 evacuate_block_obj_sizes [size_index] = FALSE;
1088                         }
1089
1090                         pin_or_update_par (ptr, obj, vt, queue);
1091                         mono_sgen_set_pinned_from_failed_allocation (objsize);
1092                         return;
1093                 }
1094
1095                 /*
1096                  * We do this before the CAS because we want to make
1097                  * sure that if another thread sees the destination
1098                  * pointer the VTable is already in place.  Not doing
1099                  * this can crash binary protocols.
1100                  */
1101                 *(MonoVTable**)destination = vt;
1102
1103                 if (SGEN_CAS_PTR (obj, (void*)((mword)destination | SGEN_FORWARDED_BIT), vt) == vt) {
1104                         gboolean was_marked;
1105
1106                         par_copy_object_no_checks (destination, vt, obj, objsize, has_references ? queue : NULL);
1107                         obj = destination;
1108                         *ptr = obj;
1109
1110                         /*
1111                          * FIXME: If we make major_alloc_object() give
1112                          * us the block info, too, we won't have to
1113                          * re-fetch it here.
1114                          */
1115                         block = MS_BLOCK_FOR_OBJ (obj);
1116                         MS_CALC_MARK_BIT (word, bit, obj);
1117                         DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
1118                         MS_PAR_SET_MARK_BIT (was_marked, block, word, bit);
1119                 } else {
1120                         /*
1121                          * FIXME: We have allocated destination, but
1122                          * we cannot use it.  Give it back to the
1123                          * allocator.
1124                          */
1125                         *(void**)destination = NULL;
1126
1127                         vtable_word = *(mword*)obj;
1128                         g_assert (vtable_word & SGEN_FORWARDED_BIT);
1129
1130                         obj = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1131
1132                         *ptr = obj;
1133
1134                         ++stat_slots_allocated_in_vain;
1135                 }
1136         } else {
1137 #ifdef FIXED_HEAP
1138                 if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
1139 #else
1140                 mword vtable_word = *(mword*)obj;
1141                 vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1142
1143                 /* see comment in the non-parallel version below */
1144                 if (vtable_word & SGEN_FORWARDED_BIT) {
1145                         *ptr = (void*)vt;
1146                         return;
1147                 }
1148                 objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
1149
1150                 if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
1151 #endif
1152                 {
1153                         int size_index;
1154
1155                         block = MS_BLOCK_FOR_OBJ (obj);
1156                         size_index = block->obj_size_index;
1157
1158                         if (!block->has_pinned && evacuate_block_obj_sizes [size_index]) {
1159                                 if (block->is_to_space)
1160                                         return;
1161
1162 #ifdef FIXED_HEAP
1163                                 {
1164                                         mword vtable_word = *(mword*)obj;
1165                                         vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1166
1167                                         if (vtable_word & SGEN_FORWARDED_BIT) {
1168                                                 *ptr = (void*)vt;
1169                                                 return;
1170                                         }
1171                                 }
1172 #endif
1173
1174                                 HEAVY_STAT (++stat_major_objects_evacuated);
1175                                 goto do_copy_object;
1176                         }
1177
1178                         MS_PAR_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1179                 } else {
1180 #ifdef FIXED_HEAP
1181                         mword vtable_word = *(mword*)obj;
1182                         vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1183 #endif
1184
1185                         if (vtable_word & SGEN_PINNED_BIT)
1186                                 return;
1187                         binary_protocol_pin (obj, vt, mono_sgen_safe_object_get_size ((MonoObject*)obj));
1188                         if (SGEN_CAS_PTR (obj, (void*)(vtable_word | SGEN_PINNED_BIT), (void*)vtable_word) == (void*)vtable_word) {
1189                                 if (SGEN_VTABLE_HAS_REFERENCES (vt))
1190                                         GRAY_OBJECT_ENQUEUE (queue, obj);
1191                         } else {
1192                                 g_assert (SGEN_OBJECT_IS_PINNED (obj));
1193                         }
1194                 }
1195         }
1196 }
1197 #else
1198 static void
1199 major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
1200 {
1201         void *obj = *ptr;
1202         MSBlockInfo *block;
1203
1204         HEAVY_STAT (++stat_copy_object_called_major);
1205
1206         DEBUG (9, g_assert (obj));
1207         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
1208
1209         if (mono_sgen_ptr_in_nursery (obj)) {
1210                 int word, bit;
1211                 char *forwarded, *old_obj;
1212
1213                 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
1214                         *ptr = forwarded;
1215                         return;
1216                 }
1217                 if (SGEN_OBJECT_IS_PINNED (obj))
1218                         return;
1219
1220                 HEAVY_STAT (++stat_objects_copied_major);
1221
1222         do_copy_object:
1223                 old_obj = obj;
1224                 obj = copy_object_no_checks (obj, queue);
1225                 if (G_UNLIKELY (old_obj == obj)) {
1226                         /*If we fail to evacuate an object we just stop doing it for a given block size as all other will surely fail too.*/
1227                         if (!mono_sgen_ptr_in_nursery (obj)) {
1228                                 int size_index;
1229                                 block = MS_BLOCK_FOR_OBJ (obj);
1230                                 size_index = block->obj_size_index;
1231                                 evacuate_block_obj_sizes [size_index] = FALSE;
1232                                 MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1233                         }
1234                         return;
1235                 }
1236                 *ptr = obj;
1237
1238                 /*
1239                  * FIXME: See comment for copy_object_no_checks().  If
1240                  * we have that, we can let the allocation function
1241                  * give us the block info, too, and we won't have to
1242                  * re-fetch it.
1243                  */
1244                 block = MS_BLOCK_FOR_OBJ (obj);
1245                 MS_CALC_MARK_BIT (word, bit, obj);
1246                 DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
1247                 MS_SET_MARK_BIT (block, word, bit);
1248         } else {
1249                 char *forwarded;
1250 #ifdef FIXED_HEAP
1251                 if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
1252 #else
1253                 mword objsize;
1254
1255                 /*
1256                  * If we have don't have a fixed heap we cannot know
1257                  * whether an object is in the LOS or in the small
1258                  * object major heap without checking its size.  To do
1259                  * that, however, we need to know that we actually
1260                  * have a valid object, not a forwarding pointer, so
1261                  * we have to do this check first.
1262                  */
1263                 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
1264                         *ptr = forwarded;
1265                         return;
1266                 }
1267
1268                 objsize = SGEN_ALIGN_UP (mono_sgen_safe_object_get_size ((MonoObject*)obj));
1269
1270                 if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
1271 #endif
1272                 {
1273                         int size_index;
1274                         gboolean evacuate;
1275
1276                         block = MS_BLOCK_FOR_OBJ (obj);
1277                         size_index = block->obj_size_index;
1278                         evacuate = evacuate_block_obj_sizes [size_index];
1279
1280 #ifdef FIXED_HEAP
1281                         /*
1282                          * We could also check for !block->has_pinned
1283                          * here, but it would only make an uncommon case
1284                          * faster, namely objects that are in blocks
1285                          * whose slot sizes are evacuated but which have
1286                          * pinned objects.
1287                          */
1288                         if (evacuate && (forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
1289                                 *ptr = forwarded;
1290                                 return;
1291                         }
1292 #endif
1293
1294                         if (evacuate && !block->has_pinned) {
1295                                 g_assert (!SGEN_OBJECT_IS_PINNED (obj));
1296                                 if (block->is_to_space)
1297                                         return;
1298                                 HEAVY_STAT (++stat_major_objects_evacuated);
1299                                 goto do_copy_object;
1300                         } else {
1301                                 MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
1302                         }
1303                 } else {
1304                         if (SGEN_OBJECT_IS_PINNED (obj))
1305                                 return;
1306                         binary_protocol_pin (obj, (gpointer)SGEN_LOAD_VTABLE (obj), mono_sgen_safe_object_get_size ((MonoObject*)obj));
1307                         SGEN_PIN_OBJECT (obj);
1308                         /* FIXME: only enqueue if object has references */
1309                         GRAY_OBJECT_ENQUEUE (queue, obj);
1310                 }
1311         }
1312 }
1313 #endif
1314
1315 #include "sgen-major-scan-object.h"
1316
1317 static void
1318 mark_pinned_objects_in_block (MSBlockInfo *block, SgenGrayQueue *queue)
1319 {
1320         int i;
1321         int last_index = -1;
1322
1323         if (!block->pin_queue_num_entries)
1324                 return;
1325
1326         block->has_pinned = TRUE;
1327
1328         for (i = 0; i < block->pin_queue_num_entries; ++i) {
1329                 int index = MS_BLOCK_OBJ_INDEX (block->pin_queue_start [i], block);
1330                 DEBUG (9, g_assert (index >= 0 && index < MS_BLOCK_FREE / block->obj_size));
1331                 if (index == last_index)
1332                         continue;
1333                 MS_MARK_OBJECT_AND_ENQUEUE_CHECKED (MS_BLOCK_OBJ (block, index), block, queue);
1334                 last_index = index;
1335         }
1336 }
1337
1338 static void
1339 ms_sweep (void)
1340 {
1341         int i;
1342         MSBlockInfo **iter;
1343
1344         /* statistics for evacuation */
1345         int *slots_available = alloca (sizeof (int) * num_block_obj_sizes);
1346         int *slots_used = alloca (sizeof (int) * num_block_obj_sizes);
1347         int *num_blocks = alloca (sizeof (int) * num_block_obj_sizes);
1348
1349         for (i = 0; i < num_block_obj_sizes; ++i)
1350                 slots_available [i] = slots_used [i] = num_blocks [i] = 0;
1351
1352         /* clear all the free lists */
1353         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
1354                 MSBlockInfo **free_blocks = free_block_lists [i];
1355                 int j;
1356                 for (j = 0; j < num_block_obj_sizes; ++j)
1357                         free_blocks [j] = NULL;
1358         }
1359
1360         /* traverse all blocks, free and zero unmarked objects */
1361         iter = &all_blocks;
1362         while (*iter) {
1363                 MSBlockInfo *block = *iter;
1364                 int count;
1365                 gboolean have_live = FALSE;
1366                 gboolean has_pinned;
1367                 int obj_index;
1368                 int obj_size_index;
1369
1370                 obj_size_index = block->obj_size_index;
1371
1372                 has_pinned = block->has_pinned;
1373                 block->has_pinned = block->pinned;
1374
1375                 block->is_to_space = FALSE;
1376
1377                 count = MS_BLOCK_FREE / block->obj_size;
1378                 block->free_list = NULL;
1379
1380                 for (obj_index = 0; obj_index < count; ++obj_index) {
1381                         int word, bit;
1382                         void *obj = MS_BLOCK_OBJ (block, obj_index);
1383
1384                         MS_CALC_MARK_BIT (word, bit, obj);
1385                         if (MS_MARK_BIT (block, word, bit)) {
1386                                 DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
1387                                 have_live = TRUE;
1388                                 if (!has_pinned)
1389                                         ++slots_used [obj_size_index];
1390                         } else {
1391                                 /* an unmarked object */
1392                                 if (MS_OBJ_ALLOCED (obj, block)) {
1393                                         binary_protocol_empty (obj, block->obj_size);
1394                                         memset (obj, 0, block->obj_size);
1395                                 }
1396                                 *(void**)obj = block->free_list;
1397                                 block->free_list = obj;
1398                         }
1399                 }
1400
1401                 /* reset mark bits */
1402                 memset (block->mark_words, 0, sizeof (mword) * MS_NUM_MARK_WORDS);
1403
1404                 /*
1405                  * FIXME: reverse free list so that it's in address
1406                  * order
1407                  */
1408
1409                 if (have_live) {
1410                         if (!has_pinned) {
1411                                 ++num_blocks [obj_size_index];
1412                                 slots_available [obj_size_index] += count;
1413                         }
1414
1415                         iter = &block->next;
1416
1417                         /*
1418                          * If there are free slots in the block, add
1419                          * the block to the corresponding free list.
1420                          */
1421                         if (block->free_list) {
1422                                 MSBlockInfo **free_blocks = FREE_BLOCKS (block->pinned, block->has_references);
1423                                 int index = MS_BLOCK_OBJ_SIZE_INDEX (block->obj_size);
1424                                 block->next_free = free_blocks [index];
1425                                 free_blocks [index] = block;
1426                         }
1427
1428                         update_heap_boundaries_for_block (block);
1429                 } else {
1430                         /*
1431                          * Blocks without live objects are removed from the
1432                          * block list and freed.
1433                          */
1434                         *iter = block->next;
1435
1436 #ifdef FIXED_HEAP
1437                         ms_free_block (block);
1438 #else
1439                         ms_free_block (block->block);
1440
1441                         mono_sgen_free_internal (block, INTERNAL_MEM_MS_BLOCK_INFO);
1442 #endif
1443
1444                         --num_major_sections;
1445                 }
1446         }
1447
1448         for (i = 0; i < num_block_obj_sizes; ++i) {
1449                 float usage = (float)slots_used [i] / (float)slots_available [i];
1450                 if (num_blocks [i] > 5 && usage < evacuation_threshold) {
1451                         evacuate_block_obj_sizes [i] = TRUE;
1452                         /*
1453                         g_print ("slot size %d - %d of %d used\n",
1454                                         block_obj_sizes [i], slots_used [i], slots_available [i]);
1455                         */
1456                 } else {
1457                         evacuate_block_obj_sizes [i] = FALSE;
1458                 }
1459         }
1460
1461         have_swept = TRUE;
1462 }
1463
1464 static mono_native_thread_return_t
1465 ms_sweep_thread_func (void *dummy)
1466 {
1467         g_assert (concurrent_sweep);
1468
1469         for (;;) {
1470                 int result;
1471
1472                 while ((result = MONO_SEM_WAIT (&ms_sweep_cmd_semaphore)) != 0) {
1473                         if (errno != EINTR)
1474                                 g_error ("MONO_SEM_WAIT");
1475                 }
1476
1477                 ms_sweep ();
1478
1479                 ms_signal_sweep_done ();
1480         }
1481
1482         return NULL;
1483 }
1484
1485 static void
1486 major_sweep (void)
1487 {
1488         if (concurrent_sweep) {
1489                 g_assert (ms_sweep_thread);
1490                 ms_signal_sweep_command ();
1491         } else {
1492                 ms_sweep ();
1493         }
1494 }
1495
1496 static int count_pinned_ref;
1497 static int count_pinned_nonref;
1498 static int count_nonpinned_ref;
1499 static int count_nonpinned_nonref;
1500
1501 static void
1502 count_nonpinned_callback (char *obj, size_t size, void *data)
1503 {
1504         MonoVTable *vtable = (MonoVTable*)LOAD_VTABLE (obj);
1505
1506         if (vtable->klass->has_references)
1507                 ++count_nonpinned_ref;
1508         else
1509                 ++count_nonpinned_nonref;
1510 }
1511
1512 static void
1513 count_pinned_callback (char *obj, size_t size, void *data)
1514 {
1515         MonoVTable *vtable = (MonoVTable*)LOAD_VTABLE (obj);
1516
1517         if (vtable->klass->has_references)
1518                 ++count_pinned_ref;
1519         else
1520                 ++count_pinned_nonref;
1521 }
1522
1523 static void __attribute__ ((unused))
1524 count_ref_nonref_objs (void)
1525 {
1526         int total;
1527
1528         count_pinned_ref = 0;
1529         count_pinned_nonref = 0;
1530         count_nonpinned_ref = 0;
1531         count_nonpinned_nonref = 0;
1532
1533         major_iterate_objects (TRUE, FALSE, count_nonpinned_callback, NULL);
1534         major_iterate_objects (FALSE, TRUE, count_pinned_callback, NULL);
1535
1536         total = count_pinned_nonref + count_nonpinned_nonref + count_pinned_ref + count_nonpinned_ref;
1537
1538         g_print ("ref: %d pinned %d non-pinned   non-ref: %d pinned %d non-pinned  --  %.1f\n",
1539                         count_pinned_ref, count_nonpinned_ref,
1540                         count_pinned_nonref, count_nonpinned_nonref,
1541                         (count_pinned_nonref + count_nonpinned_nonref) * 100.0 / total);
1542 }
1543
1544 static int
1545 ms_calculate_block_obj_sizes (double factor, int *arr)
1546 {
1547         double target_size = sizeof (MonoObject);
1548         int num_sizes = 0;
1549         int last_size = 0;
1550
1551         do {
1552                 int target_count = ceil (MS_BLOCK_FREE / target_size);
1553                 int size = MIN ((MS_BLOCK_FREE / target_count) & ~(SGEN_ALLOC_ALIGN - 1), SGEN_MAX_SMALL_OBJ_SIZE);
1554
1555                 if (size != last_size) {
1556                         if (arr)
1557                                 arr [num_sizes] = size;
1558                         ++num_sizes;
1559                         last_size = size;
1560                 }
1561
1562                 target_size *= factor;
1563         } while (last_size < SGEN_MAX_SMALL_OBJ_SIZE);
1564
1565         return num_sizes;
1566 }
1567
1568 /* only valid during minor collections */
1569 static int old_num_major_sections;
1570
1571 static void
1572 major_start_nursery_collection (void)
1573 {
1574         ms_wait_for_sweep_done ();
1575
1576 #ifdef MARKSWEEP_CONSISTENCY_CHECK
1577         consistency_check ();
1578 #endif
1579
1580         old_num_major_sections = num_major_sections;
1581 }
1582
1583 static void
1584 major_finish_nursery_collection (void)
1585 {
1586 #ifdef MARKSWEEP_CONSISTENCY_CHECK
1587         consistency_check ();
1588 #endif
1589         mono_sgen_register_major_sections_alloced (num_major_sections - old_num_major_sections);
1590 }
1591
1592 static void
1593 major_start_major_collection (void)
1594 {
1595         int i;
1596
1597         ms_wait_for_sweep_done ();
1598
1599         /* clear the free lists */
1600         for (i = 0; i < num_block_obj_sizes; ++i) {
1601                 if (!evacuate_block_obj_sizes [i])
1602                         continue;
1603
1604                 free_block_lists [0][i] = NULL;
1605                 free_block_lists [MS_BLOCK_FLAG_REFS][i] = NULL;
1606         }
1607 }
1608
1609 static void
1610 major_finish_major_collection (void)
1611 {
1612 }
1613
1614 static void
1615 major_have_computer_minor_collection_allowance (void)
1616 {
1617 #ifndef FIXED_HEAP
1618         int section_reserve = mono_sgen_get_minor_collection_allowance () / MS_BLOCK_SIZE;
1619
1620         g_assert (have_swept);
1621         ms_wait_for_sweep_done ();
1622         g_assert (!ms_sweep_in_progress);
1623
1624         /*
1625          * FIXME: We don't free blocks on 32 bit platforms because it
1626          * can lead to address space fragmentation, since we're
1627          * allocating blocks in larger contingents.
1628          */
1629         if (sizeof (mword) < 8)
1630                 return;
1631
1632         while (num_empty_blocks > section_reserve) {
1633                 void *next = *(void**)empty_blocks;
1634                 mono_sgen_free_os_memory (empty_blocks, MS_BLOCK_SIZE);
1635                 empty_blocks = next;
1636                 /*
1637                  * Needs not be atomic because this is running
1638                  * single-threaded.
1639                  */
1640                 --num_empty_blocks;
1641
1642                 ++stat_major_blocks_freed;
1643         }
1644 #endif
1645 }
1646
1647 static void
1648 major_find_pin_queue_start_ends (SgenGrayQueue *queue)
1649 {
1650         MSBlockInfo *block;
1651
1652         FOREACH_BLOCK (block) {
1653                 block->pin_queue_start = mono_sgen_find_optimized_pin_queue_area (block->block + MS_BLOCK_SKIP, block->block + MS_BLOCK_SIZE,
1654                                 &block->pin_queue_num_entries);
1655         } END_FOREACH_BLOCK;
1656 }
1657
1658 static void
1659 major_pin_objects (SgenGrayQueue *queue)
1660 {
1661         MSBlockInfo *block;
1662
1663         FOREACH_BLOCK (block) {
1664                 mark_pinned_objects_in_block (block, queue);
1665         } END_FOREACH_BLOCK;
1666 }
1667
1668 static void
1669 major_init_to_space (void)
1670 {
1671 }
1672
1673 static void
1674 major_report_pinned_memory_usage (void)
1675 {
1676         g_assert_not_reached ();
1677 }
1678
1679 static gint64
1680 major_get_used_size (void)
1681 {
1682         gint64 size = 0;
1683         MSBlockInfo *block;
1684
1685         FOREACH_BLOCK (block) {
1686                 int count = MS_BLOCK_FREE / block->obj_size;
1687                 void **iter;
1688                 size += count * block->obj_size;
1689                 for (iter = block->free_list; iter; iter = (void**)*iter)
1690                         size -= block->obj_size;
1691         } END_FOREACH_BLOCK;
1692
1693         return size;
1694 }
1695
1696 static int
1697 get_num_major_sections (void)
1698 {
1699         return num_major_sections;
1700 }
1701
1702 static gboolean
1703 major_handle_gc_param (const char *opt)
1704 {
1705 #ifdef FIXED_HEAP
1706         if (g_str_has_prefix (opt, "major-heap-size=")) {
1707                 const char *arg = strchr (opt, '=') + 1;
1708                 glong size;
1709                 if (!mono_gc_parse_environment_string_extract_number (arg, &size))
1710                         return FALSE;
1711                 ms_heap_num_blocks = (size + MS_BLOCK_SIZE - 1) / MS_BLOCK_SIZE;
1712                 g_assert (ms_heap_num_blocks > 0);
1713                 return TRUE;
1714         } else
1715 #endif
1716         if (g_str_has_prefix (opt, "evacuation-threshold=")) {
1717                 const char *arg = strchr (opt, '=') + 1;
1718                 int percentage = atoi (arg);
1719                 if (percentage < 0 || percentage > 100) {
1720                         fprintf (stderr, "evacuation-threshold must be an integer in the range 0-100.\n");
1721                         exit (1);
1722                 }
1723                 evacuation_threshold = (float)percentage / 100.0;
1724                 return TRUE;
1725         } else if (!strcmp (opt, "concurrent-sweep")) {
1726                 concurrent_sweep = TRUE;
1727                 return TRUE;
1728         } else if (!strcmp (opt, "no-concurrent-sweep")) {
1729                 concurrent_sweep = FALSE;
1730                 return TRUE;
1731         }
1732
1733         return FALSE;
1734 }
1735
1736 static void
1737 major_print_gc_param_usage (void)
1738 {
1739         fprintf (stderr,
1740                         ""
1741 #ifdef FIXED_HEAP
1742                         "  major-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n"
1743 #endif
1744                         "  evacuation-threshold=P (where P is a percentage, an integer in 0-100)\n"
1745                         "  (no-)concurrent-sweep\n"
1746                         );
1747 }
1748
1749 #ifdef SGEN_HAVE_CARDTABLE
1750 static void
1751 major_iterate_live_block_ranges (sgen_cardtable_block_callback callback)
1752 {
1753         MSBlockInfo *block;
1754
1755         FOREACH_BLOCK (block) {
1756                 if (block->has_references)
1757                         callback ((mword)block->block, MS_BLOCK_SIZE);
1758         } END_FOREACH_BLOCK;
1759 }
1760
1761 #ifdef HEAVY_STATISTICS
1762 extern long long marked_cards;
1763 extern long long scanned_cards;
1764 extern long long scanned_objects;
1765 extern long long remarked_cards;
1766 #endif
1767
1768 #define CARD_WORDS_PER_BLOCK (CARDS_PER_BLOCK / SIZEOF_VOID_P)
1769 /*
1770  * MS blocks are 16K aligned.
1771  * Cardtables are 4K aligned, at least.
1772  * This means that the cardtable of a given block is 32 bytes aligned.
1773  */
1774 static guint8*
1775 initial_skip_card (guint8 *card_data)
1776 {
1777         mword *cards = (mword*)card_data;
1778         mword card;
1779         int i;
1780         for (i = 0; i < CARD_WORDS_PER_BLOCK; ++i) {
1781                 card = cards [i];
1782                 if (card)
1783                         break;
1784         }
1785
1786         if (i == CARD_WORDS_PER_BLOCK)
1787                 return card_data + CARDS_PER_BLOCK;
1788
1789 #if defined(__i386__) && defined(__GNUC__)
1790         return card_data + i * 4 +  (__builtin_ffs (card) - 1) / 8;
1791 #elif defined(__x86_64__) && defined(__GNUC__)
1792         return card_data + i * 8 +  (__builtin_ffsll (card) - 1) / 8;
1793 #elif defined(__s390x__) && defined(__GNUC__)
1794         return card_data + i * 8 +  (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1795 #else
1796         for (i = i * SIZEOF_VOID_P; i < CARDS_PER_BLOCK; ++i) {
1797                 if (card_data [i])
1798                         return &card_data [i];
1799         }
1800         return card_data;
1801 #endif
1802 }
1803
1804
1805 static G_GNUC_UNUSED guint8*
1806 skip_card (guint8 *card_data, guint8 *card_data_end)
1807 {
1808         while (card_data < card_data_end && !*card_data)
1809                 ++card_data;
1810         return card_data;
1811 }
1812
1813 #define MS_BLOCK_OBJ_INDEX_FAST(o,b,os) (((char*)(o) - ((b) + MS_BLOCK_SKIP)) / (os))
1814 #define MS_BLOCK_OBJ_FAST(b,os,i)                       ((b) + MS_BLOCK_SKIP + (os) * (i))
1815 #define MS_OBJ_ALLOCED_FAST(o,b)                (*(void**)(o) && (*(char**)(o) < (b) || *(char**)(o) >= (b) + MS_BLOCK_SIZE))
1816
1817 static void
1818 major_scan_card_table (SgenGrayQueue *queue)
1819 {
1820         MSBlockInfo *block;
1821
1822         FOREACH_BLOCK (block) {
1823                 int block_obj_size;
1824                 char *block_start;
1825
1826                 if (!block->has_references)
1827                         continue;
1828
1829                 block_obj_size = block->obj_size;
1830                 block_start = block->block;
1831
1832                 if (block_obj_size >= CARD_SIZE_IN_BYTES) {
1833                         guint8 *cards;
1834 #ifndef SGEN_HAVE_OVERLAPPING_CARDS
1835                         guint8 cards_data [CARDS_PER_BLOCK];
1836 #endif
1837                         char *obj, *end, *base;
1838
1839                         /*We can avoid the extra copy since the remark cardtable was cleaned before */
1840 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1841                         cards = sgen_card_table_get_card_scan_address ((mword)block_start);
1842 #else
1843                         cards = cards_data;
1844                         if (!sgen_card_table_get_card_data (cards_data, (mword)block_start, CARDS_PER_BLOCK))
1845                                 continue;
1846 #endif
1847
1848                         obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, 0);
1849                         end = block_start + MS_BLOCK_SIZE;
1850                         base = sgen_card_table_align_pointer (obj);
1851
1852                         while (obj < end) {
1853                                 if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
1854                                         int card_offset = (obj - base) >> CARD_BITS;
1855                                         sgen_cardtable_scan_object (obj, block_obj_size, cards + card_offset, queue);
1856                                 }
1857                                 obj += block_obj_size;
1858                         }
1859                 } else {
1860                         ScanObjectFunc scan_func = mono_sgen_get_minor_scan_object ();
1861                         guint8 *card_data, *card_base;
1862                         guint8 *card_data_end;
1863
1864                         /*
1865                          * This is safe in face of card aliasing for the following reason:
1866                          *
1867                          * Major blocks are 16k aligned, or 32 cards aligned.
1868                          * Cards aliasing happens in powers of two, so as long as major blocks are aligned to their
1869                          * sizes, they won't overflow the cardtable overlap modulus.
1870                          */
1871                         card_data = card_base = sgen_card_table_get_card_scan_address ((mword)block_start);
1872                         card_data_end = card_data + CARDS_PER_BLOCK;
1873
1874                         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)) {
1875                                 int index;
1876                                 int idx = card_data - card_base;
1877                                 char *start = (char*)(block_start + idx * CARD_SIZE_IN_BYTES);
1878                                 char *end = start + CARD_SIZE_IN_BYTES;
1879                                 char *obj;
1880
1881                                 HEAVY_STAT (++scanned_cards);
1882
1883                                 if (!*card_data)
1884                                         continue;
1885
1886                                 HEAVY_STAT (++marked_cards);
1887
1888                                 sgen_card_table_prepare_card_for_scanning (card_data);
1889
1890                                 if (idx == 0)
1891                                         index = 0;
1892                                 else
1893                                         index = MS_BLOCK_OBJ_INDEX_FAST (start, block_start, block_obj_size);
1894
1895                                 obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, index);
1896                                 while (obj < end) {
1897                                         if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
1898                                                 HEAVY_STAT (++scanned_objects);
1899                                                 scan_func (obj, queue);
1900                                         }
1901                                         obj += block_obj_size;
1902                                 }
1903                                 HEAVY_STAT (if (*card_data) ++remarked_cards);
1904                         }
1905                 }
1906         } END_FOREACH_BLOCK;
1907 }
1908 #endif
1909
1910 static gboolean
1911 major_is_worker_thread (MonoNativeThreadId thread)
1912 {
1913         if (concurrent_sweep)
1914                 return thread == ms_sweep_thread;
1915         else
1916                 return FALSE;
1917 }
1918
1919 static void
1920 alloc_free_block_lists (MSBlockInfo ***lists)
1921 {
1922         int i;
1923         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i)
1924                 lists [i] = mono_sgen_alloc_internal_dynamic (sizeof (MSBlockInfo*) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
1925 }
1926
1927 #ifdef SGEN_PARALLEL_MARK
1928 static void*
1929 major_alloc_worker_data (void)
1930 {
1931         /* FIXME: free this when the workers come down */
1932         MSBlockInfo ***lists = malloc (sizeof (MSBlockInfo**) * MS_BLOCK_TYPE_MAX);
1933         alloc_free_block_lists (lists);
1934         return lists;
1935 }
1936
1937 static void
1938 major_init_worker_thread (void *data)
1939 {
1940         MSBlockInfo ***lists = data;
1941         int i;
1942
1943         g_assert (lists && lists != free_block_lists);
1944         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
1945                 int j;
1946                 for (j = 0; j < num_block_obj_sizes; ++j)
1947                         g_assert (!lists [i][j]);
1948         }
1949
1950 #ifdef HAVE_KW_THREAD
1951         workers_free_block_lists = data;
1952 #else
1953         mono_native_tls_set_value (workers_free_block_lists_key, data);
1954 #endif
1955 }
1956
1957 static void
1958 major_reset_worker_data (void *data)
1959 {
1960         MSBlockInfo ***lists = data;
1961         int i;
1962         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
1963                 int j;
1964                 for (j = 0; j < num_block_obj_sizes; ++j)
1965                         lists [i][j] = NULL;
1966         }
1967 }
1968 #endif
1969
1970 #undef pthread_create
1971
1972 static void
1973 post_param_init (void)
1974 {
1975         if (concurrent_sweep) {
1976                 if (mono_native_thread_create (&ms_sweep_thread, ms_sweep_thread_func, NULL)) {
1977                         fprintf (stderr, "Error: Could not create sweep thread.\n");
1978                         exit (1);
1979                 }
1980         }
1981 }
1982
1983 void
1984 #ifdef SGEN_PARALLEL_MARK
1985 #ifdef FIXED_HEAP
1986 mono_sgen_marksweep_fixed_par_init
1987 #else
1988 mono_sgen_marksweep_par_init
1989 #endif
1990 #else
1991 #ifdef FIXED_HEAP
1992 mono_sgen_marksweep_fixed_init
1993 #else
1994 mono_sgen_marksweep_init
1995 #endif
1996 #endif
1997         (SgenMajorCollector *collector)
1998 {
1999         int i;
2000
2001 #ifndef FIXED_HEAP
2002         mono_sgen_register_fixed_internal_mem_type (INTERNAL_MEM_MS_BLOCK_INFO, sizeof (MSBlockInfo));
2003 #endif
2004
2005         num_block_obj_sizes = ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, NULL);
2006         block_obj_sizes = mono_sgen_alloc_internal_dynamic (sizeof (int) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
2007         ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, block_obj_sizes);
2008
2009         evacuate_block_obj_sizes = mono_sgen_alloc_internal_dynamic (sizeof (gboolean) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
2010         for (i = 0; i < num_block_obj_sizes; ++i)
2011                 evacuate_block_obj_sizes [i] = FALSE;
2012
2013         /*
2014         {
2015                 int i;
2016                 g_print ("block object sizes:\n");
2017                 for (i = 0; i < num_block_obj_sizes; ++i)
2018                         g_print ("%d\n", block_obj_sizes [i]);
2019         }
2020         */
2021
2022         alloc_free_block_lists (free_block_lists);
2023
2024         for (i = 0; i < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES; ++i)
2025                 fast_block_obj_size_indexes [i] = ms_find_block_obj_size_index (i * 8);
2026         for (i = 0; i < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES * 8; ++i)
2027                 g_assert (MS_BLOCK_OBJ_SIZE_INDEX (i) == ms_find_block_obj_size_index (i));
2028
2029 #ifdef SGEN_PARALLEL_MARK
2030         LOCK_INIT (ms_block_list_mutex);
2031 #endif
2032
2033         mono_counters_register ("# major blocks allocated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_alloced);
2034         mono_counters_register ("# major blocks freed", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_freed);
2035         mono_counters_register ("# major objects evacuated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_objects_evacuated);
2036         mono_counters_register ("Wait for sweep time", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &stat_time_wait_for_sweep);
2037 #ifdef SGEN_PARALLEL_MARK
2038         mono_counters_register ("Slots allocated in vain", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_slots_allocated_in_vain);
2039
2040 #ifndef HAVE_KW_THREAD
2041         mono_native_tls_alloc (&workers_free_block_lists_key, NULL);
2042 #endif
2043 #endif
2044
2045         /*
2046          * FIXME: These are superfluous if concurrent sweep is
2047          * disabled.  We might want to create them lazily.
2048          */
2049         MONO_SEM_INIT (&ms_sweep_cmd_semaphore, 0);
2050         MONO_SEM_INIT (&ms_sweep_done_semaphore, 0);
2051
2052         collector->section_size = MAJOR_SECTION_SIZE;
2053 #ifdef SGEN_PARALLEL_MARK
2054         collector->is_parallel = TRUE;
2055         collector->alloc_worker_data = major_alloc_worker_data;
2056         collector->init_worker_thread = major_init_worker_thread;
2057         collector->reset_worker_data = major_reset_worker_data;
2058 #else
2059         collector->is_parallel = FALSE;
2060 #endif
2061         collector->supports_cardtable = TRUE;
2062
2063         collector->have_swept = &have_swept;
2064
2065         collector->alloc_heap = major_alloc_heap;
2066         collector->is_object_live = major_is_object_live;
2067         collector->alloc_small_pinned_obj = major_alloc_small_pinned_obj;
2068         collector->alloc_degraded = major_alloc_degraded;
2069         collector->copy_or_mark_object = major_copy_or_mark_object;
2070         collector->alloc_object = major_alloc_object;
2071         collector->free_pinned_object = free_pinned_object;
2072         collector->iterate_objects = major_iterate_objects;
2073         collector->free_non_pinned_object = major_free_non_pinned_object;
2074         collector->find_pin_queue_start_ends = major_find_pin_queue_start_ends;
2075         collector->pin_objects = major_pin_objects;
2076 #ifdef SGEN_HAVE_CARDTABLE
2077         collector->scan_card_table = major_scan_card_table;
2078         collector->iterate_live_block_ranges = (void*)(void*) major_iterate_live_block_ranges;
2079 #endif
2080         collector->init_to_space = major_init_to_space;
2081         collector->sweep = major_sweep;
2082         collector->check_scan_starts = major_check_scan_starts;
2083         collector->dump_heap = major_dump_heap;
2084         collector->get_used_size = major_get_used_size;
2085         collector->start_nursery_collection = major_start_nursery_collection;
2086         collector->finish_nursery_collection = major_finish_nursery_collection;
2087         collector->start_major_collection = major_start_major_collection;
2088         collector->finish_major_collection = major_finish_major_collection;
2089         collector->have_computed_minor_collection_allowance = major_have_computer_minor_collection_allowance;
2090         collector->ptr_is_in_non_pinned_space = major_ptr_is_in_non_pinned_space;
2091         collector->obj_is_from_pinned_alloc = obj_is_from_pinned_alloc;
2092         collector->report_pinned_memory_usage = major_report_pinned_memory_usage;
2093         collector->get_num_major_sections = get_num_major_sections;
2094         collector->handle_gc_param = major_handle_gc_param;
2095         collector->print_gc_param_usage = major_print_gc_param_usage;
2096         collector->is_worker_thread = major_is_worker_thread;
2097         collector->post_param_init = post_param_init;
2098
2099         FILL_COLLECTOR_COPY_OBJECT (collector);
2100         FILL_COLLECTOR_SCAN_OBJECT (collector);
2101
2102 #ifdef SGEN_HAVE_CARDTABLE
2103         /*cardtable requires major pages to be 8 cards aligned*/
2104         g_assert ((MS_BLOCK_SIZE % (8 * CARD_SIZE_IN_BYTES)) == 0);
2105 #endif
2106 }
2107
2108 #endif