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 #ifdef HAVE_SGEN_GC
  30
  31 #include <math.h>
  32
  33 #include "utils/mono-counters.h"
  34 #include "metadata/object-internals.h"
  35 #include "metadata/profiler-private.h"
  36
  37 #include "metadata/sgen-gc.h"
  38 #include "metadata/sgen-protocol.h"
  39 #include "metadata/sgen-cardtable.h"
  40
  41
  42 #define DEBUG(l,x)
  43
  44 #define MS_BLOCK_SIZE   (16*1024)
  45 #define MS_BLOCK_SIZE_SHIFT     14
  46 #define MAJOR_SECTION_SIZE      MS_BLOCK_SIZE
  47 #define CARDS_PER_BLOCK (MS_BLOCK_SIZE / CARD_SIZE_IN_BYTES)
  48
  49 #ifdef FIXED_HEAP
  50 #define MS_DEFAULT_HEAP_NUM_BLOCKS      (32 * 1024) /* 512 MB */
  51 #endif
  52
  53 /*
  54  * Don't allocate single blocks, but alloc a contingent of this many
  55  * blocks in one swoop.
  56  */
  57 #define MS_BLOCK_ALLOC_NUM      32
  58
  59 /*
  60  * Number of bytes before the first object in a block.  At the start
  61  * of a block is the MSBlockHeader, then opional padding, then come
  62  * the objects, so this must be >= sizeof (MSBlockHeader).
  63  */
  64 #ifdef FIXED_HEAP
  65 #define MS_BLOCK_SKIP   0
  66 #else
  67 #define MS_BLOCK_SKIP   16
  68 #endif
  69
  70 #define MS_BLOCK_FREE   (MS_BLOCK_SIZE - MS_BLOCK_SKIP)
  71
  72 #define MS_NUM_MARK_WORDS       ((MS_BLOCK_SIZE / SGEN_ALLOC_ALIGN + sizeof (mword) * 8 - 1) / (sizeof (mword) * 8))
  73
  74 #if SGEN_MAX_SMALL_OBJ_SIZE > MS_BLOCK_FREE / 2
  75 #error MAX_SMALL_OBJ_SIZE must be at most MS_BLOCK_FREE / 2
  76 #endif
  77
  78 typedef struct _MSBlockInfo MSBlockInfo;
  79 struct _MSBlockInfo {
  80         int obj_size;
  81         gboolean pinned;
  82         gboolean has_references;
  83 #ifdef FIXED_HEAP
  84         gboolean used;
  85 #else
  86         MSBlockInfo *next;
  87 #endif
  88         char *block;
  89         void **free_list;
  90         MSBlockInfo *next_free;
  91         void **pin_queue_start;
  92         int pin_queue_num_entries;
  93         mword mark_words [MS_NUM_MARK_WORDS];
  94 };
  95
  96 #ifdef FIXED_HEAP
  97 static int ms_heap_num_blocks = MS_DEFAULT_HEAP_NUM_BLOCKS;
  98
  99 #define ms_heap_start   nursery_end
 100 static char *ms_heap_end;
 101
 102 #define MS_PTR_IN_SMALL_MAJOR_HEAP(p)   ((char*)(p) >= ms_heap_start && (char*)(p) < ms_heap_end)
 103
 104 /* array of all all block infos in the system */
 105 static MSBlockInfo *block_infos;
 106 #endif
 107
 108 #define MS_BLOCK_OBJ(b,i)               ((b)->block + MS_BLOCK_SKIP + (b)->obj_size * (i))
 109 #define MS_BLOCK_DATA_FOR_OBJ(o)        ((char*)((mword)(o) & ~(mword)(MS_BLOCK_SIZE - 1)))
 110
 111 #ifdef FIXED_HEAP
 112 #define MS_BLOCK_FOR_OBJ(o)             (&block_infos [(mword)((char*)(o) - ms_heap_start) >> MS_BLOCK_SIZE_SHIFT])
 113 #else
 114 typedef struct {
 115         MSBlockInfo *info;
 116 } MSBlockHeader;
 117
 118 #define MS_BLOCK_FOR_OBJ(o)             (((MSBlockHeader*)MS_BLOCK_DATA_FOR_OBJ ((o)))->info)
 119 #endif
 120
 121 #define MS_BLOCK_OBJ_INDEX(o,b) (((char*)(o) - ((b)->block + MS_BLOCK_SKIP)) / (b)->obj_size)
 122
 123 #define MS_CALC_MARK_BIT(w,b,o)         do {                            \
 124                 int i = ((char*)(o) - MS_BLOCK_DATA_FOR_OBJ ((o))) >> SGEN_ALLOC_ALIGN_BITS; \
 125                 if (sizeof (mword) == 4) {                              \
 126                         (w) = i >> 5;                                   \
 127                         (b) = i & 31;                                   \
 128                 } else {                                                \
 129                         (w) = i >> 6;                                   \
 130                         (b) = i & 63;                                   \
 131                 }                                                       \
 132         } while (0)
 133
 134 #define MS_MARK_BIT(bl,w,b)     ((bl)->mark_words [(w)] & (1L << (b)))
 135 #define MS_SET_MARK_BIT(bl,w,b) ((bl)->mark_words [(w)] |= (1L << (b)))
 136 #define MS_PAR_SET_MARK_BIT(was_marked,bl,w,b)  do {                    \
 137                 mword __old = (bl)->mark_words [(w)];                   \
 138                 mword __bitmask = 1L << (b);                            \
 139                 if (__old & __bitmask) {                                \
 140                         was_marked = TRUE;                              \
 141                         break;                                          \
 142                 }                                                       \
 143                 if (SGEN_CAS_PTR ((gpointer*)&(bl)->mark_words [(w)],   \
 144                                                 (gpointer)(__old | __bitmask), \
 145                                                 (gpointer)__old) ==     \
 146                                 (gpointer)__old) {                      \
 147                         was_marked = FALSE;                             \
 148                         break;                                          \
 149                 }                                                       \
 150         } while (1)
 151
 152 #define MS_OBJ_ALLOCED(o,b)     (*(void**)(o) && (*(char**)(o) < (b)->block || *(char**)(o) >= (b)->block + MS_BLOCK_SIZE))
 153
 154 #define MS_BLOCK_OBJ_SIZE_FACTOR        (sqrt (2.0))
 155
 156 /*
 157  * This way we can lookup block object size indexes for sizes up to
 158  * 256 bytes with a single load.
 159  */
 160 #define MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES      32
 161
 162 static int *block_obj_sizes;
 163 static int num_block_obj_sizes;
 164 static int fast_block_obj_size_indexes [MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES];
 165
 166 #define MS_BLOCK_FLAG_PINNED    1
 167 #define MS_BLOCK_FLAG_REFS      2
 168
 169 #define MS_BLOCK_TYPE_MAX       4
 170
 171 #ifdef SGEN_PARALLEL_MARK
 172 static LOCK_DECLARE (ms_block_list_mutex);
 173 #define LOCK_MS_BLOCK_LIST pthread_mutex_lock (&ms_block_list_mutex)
 174 #define UNLOCK_MS_BLOCK_LIST pthread_mutex_unlock (&ms_block_list_mutex)
 175 #else
 176 #define LOCK_MS_BLOCK_LIST
 177 #define UNLOCK_MS_BLOCK_LIST
 178 #endif
 179
 180 /* we get this at init */
 181 static int nursery_bits;
 182 static char *nursery_start;
 183 static char *nursery_end;
 184
 185 #define ptr_in_nursery(p)       (SGEN_PTR_IN_NURSERY ((p), nursery_bits, nursery_start, nursery_end))
 186
 187 #ifdef FIXED_HEAP
 188 /* non-allocated block free-list */
 189 static MSBlockInfo *empty_blocks = NULL;
 190 #else
 191 /* non-allocated block free-list */
 192 static void *empty_blocks = NULL;
 193 /* all allocated blocks in the system */
 194 static MSBlockInfo *all_blocks;
 195 static int num_empty_blocks = 0;
 196 #endif
 197
 198 #ifdef FIXED_HEAP
 199 #define FOREACH_BLOCK(bl)       {                                       \
 200                 int __block_i;                                          \
 201                 for (__block_i = 0; __block_i < ms_heap_num_blocks; ++__block_i) { \
 202                         (bl) = &block_infos [__block_i];                \
 203                         if (!(bl)->used) continue;
 204 #define END_FOREACH_BLOCK       }}
 205 #else
 206 #define FOREACH_BLOCK(bl)       for ((bl) = all_blocks; (bl); (bl) = (bl)->next) {
 207 #define END_FOREACH_BLOCK       }
 208 #endif
 209
 210 static int num_major_sections = 0;
 211 /* one free block list for each block object size */
 212 static MSBlockInfo **free_block_lists [MS_BLOCK_TYPE_MAX];
 213
 214 static long long stat_major_blocks_alloced = 0;
 215 static long long stat_major_blocks_freed = 0;
 216
 217 static int
 218 ms_find_block_obj_size_index (int size)
 219 {
 220         int i;
 221         DEBUG (9, g_assert (size <= SGEN_MAX_SMALL_OBJ_SIZE));
 222         for (i = 0; i < num_block_obj_sizes; ++i)
 223                 if (block_obj_sizes [i] >= size)
 224                         return i;
 225         g_assert_not_reached ();
 226 }
 227
 228 #define FREE_BLOCKS(p,r) (free_block_lists [((p) ? MS_BLOCK_FLAG_PINNED : 0) | ((r) ? MS_BLOCK_FLAG_REFS : 0)])
 229
 230 #define MS_BLOCK_OBJ_SIZE_INDEX(s)                              \
 231         (((s)+7)>>3 < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES ?      \
 232          fast_block_obj_size_indexes [((s)+7)>>3] :             \
 233          ms_find_block_obj_size_index ((s)))
 234
 235 #ifdef FIXED_HEAP
 236 static void*
 237 major_alloc_heap (mword nursery_size, mword nursery_align, int the_nursery_bits)
 238 {
 239         char *heap_start;
 240         mword major_heap_size = ms_heap_num_blocks * MS_BLOCK_SIZE;
 241         mword alloc_size = nursery_size + major_heap_size;
 242         int i;
 243
 244         g_assert (ms_heap_num_blocks > 0);
 245         g_assert (nursery_size % MS_BLOCK_SIZE == 0);
 246         if (nursery_align)
 247                 g_assert (nursery_align % MS_BLOCK_SIZE == 0);
 248
 249         nursery_start = mono_sgen_alloc_os_memory_aligned (alloc_size, nursery_align ? nursery_align : MS_BLOCK_SIZE, TRUE);
 250         nursery_end = heap_start = nursery_start + nursery_size;
 251         nursery_bits = the_nursery_bits;
 252
 253         ms_heap_end = heap_start + major_heap_size;
 254
 255         block_infos = mono_sgen_alloc_internal_dynamic (sizeof (MSBlockInfo) * ms_heap_num_blocks, INTERNAL_MEM_MS_BLOCK_INFO);
 256
 257         for (i = 0; i < ms_heap_num_blocks; ++i) {
 258                 block_infos [i].block = heap_start + i * MS_BLOCK_SIZE;
 259                 if (i < ms_heap_num_blocks - 1)
 260                         block_infos [i].next_free = &block_infos [i + 1];
 261                 else
 262                         block_infos [i].next_free = NULL;
 263         }
 264
 265         empty_blocks = &block_infos [0];
 266
 267         return nursery_start;
 268 }
 269 #else
 270 static void*
 271 major_alloc_heap (mword nursery_size, mword nursery_align, int the_nursery_bits)
 272 {
 273         if (nursery_align)
 274                 nursery_start = mono_sgen_alloc_os_memory_aligned (nursery_size, nursery_align, TRUE);
 275         else
 276                 nursery_start = mono_sgen_alloc_os_memory (nursery_size, TRUE);
 277
 278         nursery_end = nursery_start + nursery_size;
 279         nursery_bits = the_nursery_bits;
 280
 281         return nursery_start;
 282 }
 283 #endif
 284
 285 #ifdef FIXED_HEAP
 286 static MSBlockInfo*
 287 ms_get_empty_block (void)
 288 {
 289         MSBlockInfo *block;
 290
 291         g_assert (empty_blocks);
 292
 293         block = empty_blocks;
 294         empty_blocks = empty_blocks->next_free;
 295
 296         block->used = TRUE;
 297
 298         mono_sgen_update_heap_boundaries ((mword)block->block, (mword)block->block + MS_BLOCK_SIZE);
 299
 300         return block;
 301 }
 302
 303 static void
 304 ms_free_block (MSBlockInfo *block)
 305 {
 306         block->next_free = empty_blocks;
 307         empty_blocks = block;
 308         block->used = FALSE;
 309 }
 310 #else
 311 static void*
 312 ms_get_empty_block (void)
 313 {
 314         char *p;
 315         int i;
 316         void *block, *empty, *next;
 317
 318  retry:
 319         if (!empty_blocks) {
 320                 p = mono_sgen_alloc_os_memory_aligned (MS_BLOCK_SIZE * MS_BLOCK_ALLOC_NUM, MS_BLOCK_SIZE, TRUE);
 321
 322                 for (i = 0; i < MS_BLOCK_ALLOC_NUM; ++i) {
 323                         block = p;
 324                         /*
 325                          * We do the free list update one after the
 326                          * other so that other threads can use the new
 327                          * blocks as quickly as possible.
 328                          */
 329                         do {
 330                                 empty = empty_blocks;
 331                                 *(void**)block = empty;
 332                         } while (SGEN_CAS_PTR (&empty_blocks, block, empty) != empty);
 333                         p += MS_BLOCK_SIZE;
 334                 }
 335
 336                 SGEN_ATOMIC_ADD (num_empty_blocks, MS_BLOCK_ALLOC_NUM);
 337
 338                 stat_major_blocks_alloced += MS_BLOCK_ALLOC_NUM;
 339         }
 340
 341         do {
 342                 empty = empty_blocks;
 343                 if (!empty)
 344                         goto retry;
 345                 block = empty;
 346                 next = *(void**)block;
 347         } while (SGEN_CAS_PTR (&empty_blocks, next, empty) != empty);
 348
 349         SGEN_ATOMIC_ADD (num_empty_blocks, -1);
 350
 351         *(void**)block = NULL;
 352
 353         g_assert (!((mword)block & (MS_BLOCK_SIZE - 1)));
 354
 355         mono_sgen_update_heap_boundaries ((mword)block, (mword)block + MS_BLOCK_SIZE);
 356
 357         return block;
 358 }
 359
 360 static void
 361 ms_free_block (void *block)
 362 {
 363         void *empty;
 364
 365         memset (block, 0, MS_BLOCK_SIZE);
 366
 367         do {
 368                 empty = empty_blocks;
 369                 *(void**)block = empty;
 370         } while (SGEN_CAS_PTR (&empty_blocks, block, empty) != empty);
 371
 372         SGEN_ATOMIC_ADD (num_empty_blocks, 1);
 373 }
 374 #endif
 375
 376 //#define MARKSWEEP_CONSISTENCY_CHECK
 377
 378 #ifdef MARKSWEEP_CONSISTENCY_CHECK
 379 static void
 380 check_block_free_list (MSBlockInfo *block, int size, gboolean pinned)
 381 {
 382         MSBlockInfo *b;
 383
 384         for (; block; block = block->next_free) {
 385                 g_assert (block->obj_size == size);
 386                 g_assert ((pinned && block->pinned) || (!pinned && !block->pinned));
 387
 388                 /* blocks in the free lists must have at least
 389                    one free slot */
 390                 g_assert (block->free_list);
 391
 392 #ifdef FIXED_HEAP
 393                 /* the block must not be in the empty_blocks list */
 394                 for (b = empty_blocks; b; b = b->next_free)
 395                         g_assert (b != block);
 396 #else
 397                 /* the block must be in the all_blocks list */
 398                 for (b = all_blocks; b; b = b->next) {
 399                         if (b == block)
 400                                 break;
 401                 }
 402                 g_assert (b == block);
 403 #endif
 404         }
 405 }
 406
 407 static void
 408 check_empty_blocks (void)
 409 {
 410 #ifndef FIXED_HEAP
 411         void *p;
 412         int i = 0;
 413         for (p = empty_blocks; p; p = *(void**)p)
 414                 ++i;
 415         g_assert (i == num_empty_blocks);
 416 #endif
 417 }
 418
 419 static void
 420 consistency_check (void)
 421 {
 422         MSBlockInfo *block;
 423         int i;
 424
 425         /* check all blocks */
 426         FOREACH_BLOCK (block) {
 427                 int count = MS_BLOCK_FREE / block->obj_size;
 428                 int num_free = 0;
 429                 void **free;
 430
 431 #ifndef FIXED_HEAP
 432                 /* check block header */
 433                 g_assert (((MSBlockHeader*)block->block)->info == block);
 434 #endif
 435
 436                 /* count number of free slots */
 437                 for (i = 0; i < count; ++i) {
 438                         void **obj = (void**) MS_BLOCK_OBJ (block, i);
 439                         if (!MS_OBJ_ALLOCED (obj, block))
 440                                 ++num_free;
 441                 }
 442
 443                 /* check free list */
 444                 for (free = block->free_list; free; free = (void**)*free) {
 445                         g_assert (MS_BLOCK_FOR_OBJ (free) == block);
 446                         --num_free;
 447                 }
 448                 g_assert (num_free == 0);
 449
 450                 /* check all mark words are zero */
 451                 for (i = 0; i < MS_NUM_MARK_WORDS; ++i)
 452                         g_assert (block->mark_words [i] == 0);
 453         } END_FOREACH_BLOCK;
 454
 455         /* check free blocks */
 456         for (i = 0; i < num_block_obj_sizes; ++i) {
 457                 int j;
 458                 for (j = 0; j < MS_BLOCK_TYPE_MAX; ++j)
 459                         check_block_free_list (free_block_lists [j][i], block_obj_sizes [i], j & MS_BLOCK_FLAG_PINNED);
 460         }
 461
 462         check_empty_blocks ();
 463 }
 464 #endif
 465
 466 static void
 467 ms_alloc_block (int size_index, gboolean pinned, gboolean has_references)
 468 {
 469         int size = block_obj_sizes [size_index];
 470         int count = MS_BLOCK_FREE / size;
 471 #ifdef FIXED_HEAP
 472         MSBlockInfo *info = ms_get_empty_block ();
 473 #else
 474         MSBlockInfo *info = mono_sgen_alloc_internal (INTERNAL_MEM_MS_BLOCK_INFO);
 475         MSBlockHeader *header;
 476 #endif
 477         MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
 478         char *obj_start;
 479         int i;
 480
 481         DEBUG (9, g_assert (count >= 2));
 482
 483         info->obj_size = size;
 484         info->pinned = pinned;
 485         info->has_references = has_references;
 486 #ifndef FIXED_HEAP
 487         info->block = ms_get_empty_block ();
 488
 489         header = (MSBlockHeader*) info->block;
 490         header->info = info;
 491 #endif
 492
 493         /* build free list */
 494         obj_start = info->block + MS_BLOCK_SKIP;
 495         info->free_list = (void**)obj_start;
 496         /* we're skipping the last one - it must be nulled */
 497         for (i = 0; i < count - 1; ++i) {
 498                 char *next_obj_start = obj_start + size;
 499                 *(void**)obj_start = next_obj_start;
 500                 obj_start = next_obj_start;
 501         }
 502         /* the last one */
 503         *(void**)obj_start = NULL;
 504
 505         info->next_free = free_blocks [size_index];
 506         free_blocks [size_index] = info;
 507
 508 #ifndef FIXED_HEAP
 509         info->next = all_blocks;
 510         all_blocks = info;
 511 #endif
 512
 513         ++num_major_sections;
 514 }
 515
 516 static gboolean
 517 obj_is_from_pinned_alloc (char *obj)
 518 {
 519         MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
 520         return block->pinned;
 521 }
 522
 523 static void*
 524 alloc_obj (int size, gboolean pinned, gboolean has_references)
 525 {
 526         int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 527         MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, has_references);
 528         MSBlockInfo *block;
 529         void *obj;
 530
 531         /* FIXME: try to do this without locking */
 532
 533         LOCK_MS_BLOCK_LIST;
 534
 535         if (!free_blocks [size_index])
 536                 ms_alloc_block (size_index, pinned, has_references);
 537
 538         block = free_blocks [size_index];
 539         DEBUG (9, g_assert (block));
 540
 541         obj = block->free_list;
 542         DEBUG (9, g_assert (obj));
 543
 544         block->free_list = *(void**)obj;
 545         if (!block->free_list) {
 546                 free_blocks [size_index] = block->next_free;
 547                 block->next_free = NULL;
 548         }
 549
 550         UNLOCK_MS_BLOCK_LIST;
 551
 552         /*
 553          * FIXME: This should not be necessary because it'll be
 554          * overwritten by the vtable immediately.
 555          */
 556         *(void**)obj = NULL;
 557
 558         return obj;
 559 }
 560
 561 static void*
 562 major_alloc_object (int size, gboolean has_references)
 563 {
 564         return alloc_obj (size, FALSE, has_references);
 565 }
 566
 567 /*
 568  * We're not freeing the block if it's empty.  We leave that work for
 569  * the next major collection.
 570  *
 571  * This is just called from the domain clearing code, which runs in a
 572  * single thread and has the GC lock, so we don't need an extra lock.
 573  */
 574 static void
 575 free_object (char *obj, size_t size, gboolean pinned)
 576 {
 577         MSBlockInfo *block = MS_BLOCK_FOR_OBJ (obj);
 578         int word, bit;
 579         DEBUG (9, g_assert ((pinned && block->pinned) || (!pinned && !block->pinned)));
 580         DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
 581         MS_CALC_MARK_BIT (word, bit, obj);
 582         DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
 583         if (!block->free_list) {
 584                 MSBlockInfo **free_blocks = FREE_BLOCKS (pinned, block->has_references);
 585                 int size_index = MS_BLOCK_OBJ_SIZE_INDEX (size);
 586                 DEBUG (9, g_assert (!block->next_free));
 587                 block->next_free = free_blocks [size_index];
 588                 free_blocks [size_index] = block;
 589         }
 590         memset (obj, 0, size);
 591         *(void**)obj = block->free_list;
 592         block->free_list = (void**)obj;
 593 }
 594
 595 static void
 596 major_free_non_pinned_object (char *obj, size_t size)
 597 {
 598         free_object (obj, size, FALSE);
 599 }
 600
 601 /* size is a multiple of SGEN_ALLOC_ALIGN */
 602 static void*
 603 major_alloc_small_pinned_obj (size_t size, gboolean has_references)
 604 {
 605         return alloc_obj (size, TRUE, has_references);
 606 }
 607
 608 static void
 609 free_pinned_object (char *obj, size_t size)
 610 {
 611         free_object (obj, size, TRUE);
 612 }
 613
 614 /*
 615  * size is already rounded up and we hold the GC lock.
 616  */
 617 static void*
 618 major_alloc_degraded (MonoVTable *vtable, size_t size)
 619 {
 620         void *obj;
 621         int old_num_sections = num_major_sections;
 622         obj = alloc_obj (size, FALSE, vtable->klass->has_references);
 623         *(MonoVTable**)obj = vtable;
 624         HEAVY_STAT (++stat_objects_alloced_degraded);
 625         HEAVY_STAT (stat_bytes_alloced_degraded += size);
 626         g_assert (num_major_sections >= old_num_sections);
 627         mono_sgen_register_major_sections_alloced (num_major_sections - old_num_sections);
 628         return obj;
 629 }
 630
 631 #define MAJOR_OBJ_IS_IN_TO_SPACE(obj)   FALSE
 632
 633 /*
 634  * obj is some object.  If it's not in the major heap (i.e. if it's in
 635  * the nursery or LOS), return FALSE.  Otherwise return whether it's
 636  * been marked or copied.
 637  */
 638 static gboolean
 639 major_is_object_live (char *obj)
 640 {
 641         MSBlockInfo *block;
 642         int word, bit;
 643 #ifndef FIXED_HEAP
 644         mword objsize;
 645 #endif
 646
 647         if (ptr_in_nursery (obj))
 648                 return FALSE;
 649
 650 #ifdef FIXED_HEAP
 651         /* LOS */
 652         if (!MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
 653                 return FALSE;
 654 #else
 655         objsize = SGEN_ALIGN_UP (mono_sgen_safe_object_get_size ((MonoObject*)obj));
 656
 657         /* LOS */
 658         if (objsize > SGEN_MAX_SMALL_OBJ_SIZE)
 659                 return FALSE;
 660 #endif
 661
 662         /* now we know it's in a major block */
 663         block = MS_BLOCK_FOR_OBJ (obj);
 664         DEBUG (9, g_assert (!block->pinned));
 665         MS_CALC_MARK_BIT (word, bit, obj);
 666         return MS_MARK_BIT (block, word, bit) ? TRUE : FALSE;
 667 }
 668
 669 static gboolean
 670 major_ptr_is_in_non_pinned_space (char *ptr)
 671 {
 672         g_assert_not_reached ();
 673 }
 674
 675 static void
 676 major_iterate_objects (gboolean non_pinned, gboolean pinned, IterateObjectCallbackFunc callback, void *data)
 677 {
 678         MSBlockInfo *block;
 679
 680         FOREACH_BLOCK (block) {
 681                 int count = MS_BLOCK_FREE / block->obj_size;
 682                 int i;
 683
 684                 if (block->pinned && !pinned)
 685                         continue;
 686                 if (!block->pinned && !non_pinned)
 687                         continue;
 688
 689                 for (i = 0; i < count; ++i) {
 690                         void **obj = (void**) MS_BLOCK_OBJ (block, i);
 691                         if (MS_OBJ_ALLOCED (obj, block))
 692                                 callback ((char*)obj, block->obj_size, data);
 693                 }
 694         } END_FOREACH_BLOCK;
 695 }
 696
 697 static void
 698 major_check_scan_starts (void)
 699 {
 700 }
 701
 702 static void
 703 major_dump_heap (FILE *heap_dump_file)
 704 {
 705         MSBlockInfo *block;
 706
 707         FOREACH_BLOCK (block) {
 708                 int count = MS_BLOCK_FREE / block->obj_size;
 709                 int i;
 710                 int start = -1;
 711
 712                 fprintf (heap_dump_file, "<section type=\"%s\" size=\"%zu\">\n", "old", (size_t)MS_BLOCK_FREE);
 713
 714                 for (i = 0; i <= count; ++i) {
 715                         if ((i < count) && MS_OBJ_ALLOCED (MS_BLOCK_OBJ (block, i), block)) {
 716                                 if (start < 0)
 717                                         start = i;
 718                         } else {
 719                                 if (start >= 0) {
 720                                         mono_sgen_dump_occupied (MS_BLOCK_OBJ (block, start), MS_BLOCK_OBJ (block, i), block->block);
 721                                         start = -1;
 722                                 }
 723                         }
 724                 }
 725
 726                 fprintf (heap_dump_file, "</section>\n");
 727         } END_FOREACH_BLOCK;
 728 }
 729
 730 #define LOAD_VTABLE     SGEN_LOAD_VTABLE
 731
 732 #define MS_MARK_OBJECT_AND_ENQUEUE_CHECKED(obj,block,queue) do {        \
 733                 int __word, __bit;                                      \
 734                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 735                 if (!MS_MARK_BIT ((block), __word, __bit) && MS_OBJ_ALLOCED ((obj), (block))) { \
 736                         MS_SET_MARK_BIT ((block), __word, __bit);       \
 737                         if ((block)->has_references)                    \
 738                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 739                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 740                 }                                                       \
 741         } while (0)
 742 #define MS_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do {                \
 743                 int __word, __bit;                                      \
 744                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 745                 DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block))));  \
 746                 if (!MS_MARK_BIT ((block), __word, __bit)) {            \
 747                         MS_SET_MARK_BIT ((block), __word, __bit);       \
 748                         if ((block)->has_references)                    \
 749                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 750                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 751                 }                                                       \
 752         } while (0)
 753 #define MS_PAR_MARK_OBJECT_AND_ENQUEUE(obj,block,queue) do {            \
 754                 int __word, __bit;                                      \
 755                 gboolean __was_marked;                                  \
 756                 DEBUG (9, g_assert (MS_OBJ_ALLOCED ((obj), (block))));  \
 757                 MS_CALC_MARK_BIT (__word, __bit, (obj));                \
 758                 MS_PAR_SET_MARK_BIT (__was_marked, (block), __word, __bit); \
 759                 if (!__was_marked) {                                    \
 760                         if ((block)->has_references)                    \
 761                                 GRAY_OBJECT_ENQUEUE ((queue), (obj));   \
 762                         binary_protocol_mark ((obj), (gpointer)LOAD_VTABLE ((obj)), mono_sgen_safe_object_get_size ((MonoObject*)(obj))); \
 763                 }                                                       \
 764         } while (0)
 765
 766 #include "sgen-major-copy-object.h"
 767
 768 #ifdef SGEN_PARALLEL_MARK
 769 static void
 770 major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
 771 {
 772         void *obj = *ptr;
 773         mword vtable_word = *(mword*)obj;
 774         MonoVTable *vt = (MonoVTable*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
 775         mword objsize;
 776         MSBlockInfo *block;
 777
 778         HEAVY_STAT (++stat_copy_object_called_major);
 779
 780         DEBUG (9, g_assert (obj));
 781         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
 782
 783         if (ptr_in_nursery (obj)) {
 784                 int word, bit;
 785                 gboolean has_references;
 786                 void *destination;
 787
 788                 if (vtable_word & SGEN_FORWARDED_BIT) {
 789                         *ptr = (void*)vt;
 790                         return;
 791                 }
 792
 793                 if (vtable_word & SGEN_PINNED_BIT)
 794                         return;
 795
 796                 HEAVY_STAT (++stat_objects_copied_major);
 797
 798                 objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
 799                 has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
 800
 801                 destination = major_alloc_object (objsize, has_references);
 802
 803                 if (SGEN_CAS_PTR (obj, (void*)((mword)destination | SGEN_FORWARDED_BIT), vt) == vt) {
 804                         gboolean was_marked;
 805
 806                         par_copy_object_no_checks (destination, vt, obj, objsize, has_references ? queue : NULL);
 807                         obj = destination;
 808                         *ptr = obj;
 809
 810                         /*
 811                          * FIXME: If we make major_alloc_object() give
 812                          * us the block info, too, we won't have to
 813                          * re-fetch it here.
 814                          */
 815                         block = MS_BLOCK_FOR_OBJ (obj);
 816                         MS_CALC_MARK_BIT (word, bit, obj);
 817                         DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
 818                         MS_PAR_SET_MARK_BIT (was_marked, block, word, bit);
 819                 } else {
 820                         /*
 821                          * FIXME: We have allocated destination, but
 822                          * we cannot use it.  Give it back to the
 823                          * allocator.
 824                          */
 825                         *(void**)destination = NULL;
 826
 827                         vtable_word = *(mword*)obj;
 828                         g_assert (vtable_word & SGEN_FORWARDED_BIT);
 829
 830                         obj = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
 831
 832                         *ptr = obj;
 833                 }
 834         } else {
 835 #ifdef FIXED_HEAP
 836                 if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
 837 #else
 838                 objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
 839
 840                 if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
 841 #endif
 842                 {
 843                         block = MS_BLOCK_FOR_OBJ (obj);
 844                         MS_PAR_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
 845                 } else {
 846                         if (vtable_word & SGEN_PINNED_BIT)
 847                                 return;
 848                         binary_protocol_pin (obj, vt, mono_sgen_safe_object_get_size ((MonoObject*)obj));
 849                         if (SGEN_CAS_PTR (obj, (void*)(vtable_word | SGEN_PINNED_BIT), (void*)vtable_word) == (void*)vtable_word) {
 850                                 if (SGEN_VTABLE_HAS_REFERENCES (vt))
 851                                         GRAY_OBJECT_ENQUEUE (queue, obj);
 852                         } else {
 853                                 g_assert (SGEN_OBJECT_IS_PINNED (obj));
 854                         }
 855                 }
 856         }
 857 }
 858 #else
 859 static void
 860 major_copy_or_mark_object (void **ptr, SgenGrayQueue *queue)
 861 {
 862         void *obj = *ptr;
 863         mword objsize;
 864         MSBlockInfo *block;
 865
 866         HEAVY_STAT (++stat_copy_object_called_major);
 867
 868         DEBUG (9, g_assert (obj));
 869         DEBUG (9, g_assert (current_collection_generation == GENERATION_OLD));
 870
 871         if (ptr_in_nursery (obj)) {
 872                 int word, bit;
 873                 char *forwarded;
 874
 875                 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
 876                         *ptr = forwarded;
 877                         return;
 878                 }
 879                 if (SGEN_OBJECT_IS_PINNED (obj))
 880                         return;
 881
 882                 HEAVY_STAT (++stat_objects_copied_major);
 883
 884                 obj = copy_object_no_checks (obj, queue);
 885                 *ptr = obj;
 886
 887                 /*
 888                  * FIXME: See comment for copy_object_no_checks().  If
 889                  * we have that, we can let the allocation function
 890                  * give us the block info, too, and we won't have to
 891                  * re-fetch it.
 892                  */
 893                 block = MS_BLOCK_FOR_OBJ (obj);
 894                 MS_CALC_MARK_BIT (word, bit, obj);
 895                 DEBUG (9, g_assert (!MS_MARK_BIT (block, word, bit)));
 896                 MS_SET_MARK_BIT (block, word, bit);
 897         } else {
 898 #ifdef FIXED_HEAP
 899                 if (MS_PTR_IN_SMALL_MAJOR_HEAP (obj))
 900 #else
 901                 objsize = SGEN_ALIGN_UP (mono_sgen_safe_object_get_size ((MonoObject*)obj));
 902
 903                 if (objsize <= SGEN_MAX_SMALL_OBJ_SIZE)
 904 #endif
 905                 {
 906                         block = MS_BLOCK_FOR_OBJ (obj);
 907                         MS_MARK_OBJECT_AND_ENQUEUE (obj, block, queue);
 908                 } else {
 909                         if (SGEN_OBJECT_IS_PINNED (obj))
 910                                 return;
 911                         binary_protocol_pin (obj, (gpointer)SGEN_LOAD_VTABLE (obj), mono_sgen_safe_object_get_size ((MonoObject*)obj));
 912                         SGEN_PIN_OBJECT (obj);
 913                         /* FIXME: only enqueue if object has references */
 914                         GRAY_OBJECT_ENQUEUE (queue, obj);
 915                 }
 916         }
 917 }
 918 #endif
 919
 920 #include "sgen-major-scan-object.h"
 921
 922 static void
 923 mark_pinned_objects_in_block (MSBlockInfo *block, SgenGrayQueue *queue)
 924 {
 925         int i;
 926         int last_index = -1;
 927         int count = MS_BLOCK_FREE / block->obj_size;
 928
 929         for (i = 0; i < block->pin_queue_num_entries; ++i) {
 930                 int index = MS_BLOCK_OBJ_INDEX (block->pin_queue_start [i], block);
 931                 DEBUG (9, g_assert (index >= 0 && index < count));
 932                 if (index == last_index)
 933                         continue;
 934                 MS_MARK_OBJECT_AND_ENQUEUE_CHECKED (MS_BLOCK_OBJ (block, index), block, queue);
 935                 last_index = index;
 936         }
 937 }
 938
 939 static void
 940 major_sweep (void)
 941 {
 942         int i;
 943 #ifdef FIXED_HEAP
 944         int j;
 945 #else
 946         MSBlockInfo **iter;
 947 #endif
 948
 949         /* clear all the free lists */
 950         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i) {
 951                 MSBlockInfo **free_blocks = free_block_lists [i];
 952                 int j;
 953                 for (j = 0; j < num_block_obj_sizes; ++j)
 954                         free_blocks [j] = NULL;
 955         }
 956
 957         /* traverse all blocks, free and zero unmarked objects */
 958 #ifdef FIXED_HEAP
 959         for (j = 0; j < ms_heap_num_blocks; ++j) {
 960                 MSBlockInfo *block = &block_infos [j];
 961 #else
 962         iter = &all_blocks;
 963         while (*iter) {
 964                 MSBlockInfo *block = *iter;
 965 #endif
 966                 int count;
 967                 gboolean have_live = FALSE;
 968                 int obj_index;
 969
 970 #ifdef FIXED_HEAP
 971                 if (!block->used)
 972                         continue;
 973 #endif
 974
 975                 count = MS_BLOCK_FREE / block->obj_size;
 976                 block->free_list = NULL;
 977
 978                 for (obj_index = 0; obj_index < count; ++obj_index) {
 979                         int word, bit;
 980                         void *obj = MS_BLOCK_OBJ (block, obj_index);
 981
 982                         MS_CALC_MARK_BIT (word, bit, obj);
 983                         if (MS_MARK_BIT (block, word, bit)) {
 984                                 DEBUG (9, g_assert (MS_OBJ_ALLOCED (obj, block)));
 985                                 have_live = TRUE;
 986                         } else {
 987                                 /* an unmarked object */
 988                                 if (MS_OBJ_ALLOCED (obj, block)) {
 989                                         binary_protocol_empty (obj, block->obj_size);
 990                                         memset (obj, 0, block->obj_size);
 991                                 }
 992                                 *(void**)obj = block->free_list;
 993                                 block->free_list = obj;
 994                         }
 995                 }
 996
 997                 /* reset mark bits */
 998                 memset (block->mark_words, 0, sizeof (mword) * MS_NUM_MARK_WORDS);
 999
1000                 /*
1001                  * FIXME: reverse free list so that it's in address
1002                  * order
1003                  */
1004
1005                 if (have_live) {
1006 #ifndef FIXED_HEAP
1007                         iter = &block->next;
1008 #endif
1009
1010                         /*
1011                          * If there are free slots in the block, add
1012                          * the block to the corresponding free list.
1013                          */
1014                         if (block->free_list) {
1015                                 MSBlockInfo **free_blocks = FREE_BLOCKS (block->pinned, block->has_references);
1016                                 int index = MS_BLOCK_OBJ_SIZE_INDEX (block->obj_size);
1017                                 block->next_free = free_blocks [index];
1018                                 free_blocks [index] = block;
1019                         }
1020                 } else {
1021                         /*
1022                          * Blocks without live objects are removed from the
1023                          * block list and freed.
1024                          */
1025 #ifdef FIXED_HEAP
1026                         ms_free_block (block);
1027 #else
1028                         *iter = block->next;
1029
1030                         ms_free_block (block->block);
1031                         mono_sgen_free_internal (block, INTERNAL_MEM_MS_BLOCK_INFO);
1032 #endif
1033
1034                         --num_major_sections;
1035                 }
1036         }
1037 }
1038
1039 static int count_pinned_ref;
1040 static int count_pinned_nonref;
1041 static int count_nonpinned_ref;
1042 static int count_nonpinned_nonref;
1043
1044 static void
1045 count_nonpinned_callback (char *obj, size_t size, void *data)
1046 {
1047         MonoVTable *vtable = (MonoVTable*)LOAD_VTABLE (obj);
1048
1049         if (vtable->klass->has_references)
1050                 ++count_nonpinned_ref;
1051         else
1052                 ++count_nonpinned_nonref;
1053 }
1054
1055 static void
1056 count_pinned_callback (char *obj, size_t size, void *data)
1057 {
1058         MonoVTable *vtable = (MonoVTable*)LOAD_VTABLE (obj);
1059
1060         if (vtable->klass->has_references)
1061                 ++count_pinned_ref;
1062         else
1063                 ++count_pinned_nonref;
1064 }
1065
1066 static void __attribute__ ((unused))
1067 count_ref_nonref_objs (void)
1068 {
1069         int total;
1070
1071         count_pinned_ref = 0;
1072         count_pinned_nonref = 0;
1073         count_nonpinned_ref = 0;
1074         count_nonpinned_nonref = 0;
1075
1076         major_iterate_objects (TRUE, FALSE, count_nonpinned_callback, NULL);
1077         major_iterate_objects (FALSE, TRUE, count_pinned_callback, NULL);
1078
1079         total = count_pinned_nonref + count_nonpinned_nonref + count_pinned_ref + count_nonpinned_ref;
1080
1081         g_print ("ref: %d pinned %d non-pinned   non-ref: %d pinned %d non-pinned  --  %.1f\n",
1082                         count_pinned_ref, count_nonpinned_ref,
1083                         count_pinned_nonref, count_nonpinned_nonref,
1084                         (count_pinned_nonref + count_nonpinned_nonref) * 100.0 / total);
1085 }
1086
1087 static int
1088 ms_calculate_block_obj_sizes (double factor, int *arr)
1089 {
1090         double target_size = sizeof (MonoObject);
1091         int num_sizes = 0;
1092         int last_size = 0;
1093
1094         do {
1095                 int target_count = ceil (MS_BLOCK_FREE / target_size);
1096                 int size = MIN ((MS_BLOCK_FREE / target_count) & ~(SGEN_ALLOC_ALIGN - 1), SGEN_MAX_SMALL_OBJ_SIZE);
1097
1098                 if (size != last_size) {
1099                         if (arr)
1100                                 arr [num_sizes] = size;
1101                         ++num_sizes;
1102                         last_size = size;
1103                 }
1104
1105                 target_size *= factor;
1106         } while (last_size < SGEN_MAX_SMALL_OBJ_SIZE);
1107
1108         return num_sizes;
1109 }
1110
1111 /* only valid during minor collections */
1112 static int old_num_major_sections;
1113
1114 static void
1115 major_start_nursery_collection (void)
1116 {
1117 #ifdef MARKSWEEP_CONSISTENCY_CHECK
1118         consistency_check ();
1119 #endif
1120
1121         old_num_major_sections = num_major_sections;
1122 }
1123
1124 static void
1125 major_finish_nursery_collection (void)
1126 {
1127 #ifdef MARKSWEEP_CONSISTENCY_CHECK
1128         consistency_check ();
1129 #endif
1130         mono_sgen_register_major_sections_alloced (num_major_sections - old_num_major_sections);
1131 }
1132
1133 static void
1134 major_finish_major_collection (void)
1135 {
1136 #ifndef FIXED_HEAP
1137         int section_reserve = mono_sgen_get_minor_collection_allowance () / MS_BLOCK_SIZE;
1138
1139         /*
1140          * FIXME: We don't free blocks on 32 bit platforms because it
1141          * can lead to address space fragmentation, since we're
1142          * allocating blocks in larger contingents.
1143          */
1144         if (sizeof (mword) < 8)
1145                 return;
1146
1147         while (num_empty_blocks > section_reserve) {
1148                 void *next = *(void**)empty_blocks;
1149                 mono_sgen_free_os_memory (empty_blocks, MS_BLOCK_SIZE);
1150                 empty_blocks = next;
1151                 /*
1152                  * Needs not be atomic because this is running
1153                  * single-threaded.
1154                  */
1155                 --num_empty_blocks;
1156
1157                 ++stat_major_blocks_freed;
1158         }
1159 #endif
1160 }
1161
1162 static void
1163 major_find_pin_queue_start_ends (SgenGrayQueue *queue)
1164 {
1165         MSBlockInfo *block;
1166
1167         FOREACH_BLOCK (block) {
1168                 block->pin_queue_start = mono_sgen_find_optimized_pin_queue_area (block->block + MS_BLOCK_SKIP, block->block + MS_BLOCK_SIZE,
1169                                 &block->pin_queue_num_entries);
1170         } END_FOREACH_BLOCK;
1171 }
1172
1173 static void
1174 major_pin_objects (SgenGrayQueue *queue)
1175 {
1176         MSBlockInfo *block;
1177
1178         FOREACH_BLOCK (block) {
1179                 mark_pinned_objects_in_block (block, queue);
1180         } END_FOREACH_BLOCK;
1181 }
1182
1183 static void
1184 major_init_to_space (void)
1185 {
1186 }
1187
1188 static void
1189 major_report_pinned_memory_usage (void)
1190 {
1191         g_assert_not_reached ();
1192 }
1193
1194 static gint64
1195 major_get_used_size (void)
1196 {
1197         gint64 size = 0;
1198         MSBlockInfo *block;
1199
1200         FOREACH_BLOCK (block) {
1201                 int count = MS_BLOCK_FREE / block->obj_size;
1202                 void **iter;
1203                 size += count * block->obj_size;
1204                 for (iter = block->free_list; iter; iter = (void**)*iter)
1205                         size -= block->obj_size;
1206         } END_FOREACH_BLOCK;
1207
1208         return size;
1209 }
1210
1211 static int
1212 get_num_major_sections (void)
1213 {
1214         return num_major_sections;
1215 }
1216
1217 #ifdef FIXED_HEAP
1218 static gboolean
1219 major_handle_gc_param (const char *opt)
1220 {
1221         if (g_str_has_prefix (opt, "major-heap-size=")) {
1222                 const char *arg = strchr (opt, '=') + 1;
1223                 glong size;
1224                 if (!mono_sgen_parse_environment_string_extract_number (arg, &size))
1225                         return FALSE;
1226                 ms_heap_num_blocks = (size + MS_BLOCK_SIZE - 1) / MS_BLOCK_SIZE;
1227                 g_assert (ms_heap_num_blocks > 0);
1228                 return TRUE;
1229         }
1230
1231         return FALSE;
1232 }
1233
1234 static void
1235 major_print_gc_param_usage (void)
1236 {
1237         fprintf (stderr, "  major-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
1238 }
1239 #endif
1240
1241 #ifdef SGEN_HAVE_CARDTABLE
1242 static void
1243 major_iterate_live_block_ranges (sgen_cardtable_block_callback callback)
1244 {
1245         MSBlockInfo *block;
1246
1247         FOREACH_BLOCK (block) {
1248                 if (block->has_references)
1249                         callback ((mword)block->block, MS_BLOCK_SIZE);
1250         } END_FOREACH_BLOCK;
1251 }
1252
1253 #define MS_BLOCK_OBJ_INDEX_FAST(o,b,os) (((char*)(o) - ((b) + MS_BLOCK_SKIP)) / (os))
1254 #define MS_BLOCK_OBJ_FAST(b,os,i)                       ((b) + MS_BLOCK_SKIP + (os) * (i))
1255 #define MS_OBJ_ALLOCED_FAST(o,b)                (*(void**)(o) && (*(char**)(o) < (b) || *(char**)(o) >= (b) + MS_BLOCK_SIZE))
1256
1257 static void
1258 major_scan_card_table (SgenGrayQueue *queue)
1259 {
1260         MSBlockInfo *block;
1261
1262         FOREACH_BLOCK (block) {
1263                 int i;
1264                 int block_obj_size;
1265                 char *start, *block_start;
1266
1267                 if (!block->has_references)
1268                         continue;
1269
1270                 block_obj_size = block->obj_size;
1271                 start = block_start = block->block;
1272
1273                 if (block_obj_size >= CARD_SIZE_IN_BYTES) {
1274                         guint8 cards [CARDS_PER_BLOCK];
1275                         char *obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, 0);
1276                         char *end = start + MS_BLOCK_SIZE;
1277                         char *base = sgen_card_table_align_pointer (obj);
1278
1279                         sgen_card_table_get_card_data (cards, (mword)start, CARDS_PER_BLOCK);
1280
1281                         while (obj < end) {
1282                                 if (MS_OBJ_ALLOCED_FAST (obj, block_start)) {
1283                                         int card_offset = (obj - base) >> CARD_BITS;
1284                                         sgen_cardtable_scan_object (obj, block_obj_size, cards + card_offset, queue);
1285                                 }
1286                                 obj += block_obj_size;
1287                         }
1288                 } else {
1289                         for (i = 0; i < CARDS_PER_BLOCK; ++i, start += CARD_SIZE_IN_BYTES) {
1290                                 int index;
1291                                 char *obj, *end;
1292
1293                                 if (!sgen_card_table_card_begin_scanning ((mword)start))
1294                                         continue;
1295
1296                                 end = start + CARD_SIZE_IN_BYTES;
1297                                 if (i == 0)
1298                                         index = 0;
1299                                 else
1300                                         index = MS_BLOCK_OBJ_INDEX_FAST (start, block_start, block_obj_size);
1301
1302                                 obj = (char*)MS_BLOCK_OBJ_FAST (block_start, block_obj_size, index);
1303                                 while (obj < end) {
1304                                         if (MS_OBJ_ALLOCED_FAST (obj, block_start))
1305                                                 minor_scan_object (obj, queue);
1306                                         obj += block_obj_size;
1307                                 }
1308                         }
1309                 }
1310         } END_FOREACH_BLOCK;
1311 }
1312 #endif
1313
1314 void
1315 #ifdef SGEN_PARALLEL_MARK
1316 #ifdef FIXED_HEAP
1317 mono_sgen_marksweep_fixed_par_init
1318 #else
1319 mono_sgen_marksweep_par_init
1320 #endif
1321 #else
1322 #ifdef FIXED_HEAP
1323 mono_sgen_marksweep_fixed_init
1324 #else
1325 mono_sgen_marksweep_init
1326 #endif
1327 #endif
1328         (SgenMajorCollector *collector)
1329 {
1330         int i;
1331
1332 #ifndef FIXED_HEAP
1333         mono_sgen_register_fixed_internal_mem_type (INTERNAL_MEM_MS_BLOCK_INFO, sizeof (MSBlockInfo));
1334 #endif
1335
1336         num_block_obj_sizes = ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, NULL);
1337         block_obj_sizes = mono_sgen_alloc_internal_dynamic (sizeof (int) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
1338         ms_calculate_block_obj_sizes (MS_BLOCK_OBJ_SIZE_FACTOR, block_obj_sizes);
1339
1340         /*
1341         {
1342                 int i;
1343                 g_print ("block object sizes:\n");
1344                 for (i = 0; i < num_block_obj_sizes; ++i)
1345                         g_print ("%d\n", block_obj_sizes [i]);
1346         }
1347         */
1348
1349         for (i = 0; i < MS_BLOCK_TYPE_MAX; ++i)
1350                 free_block_lists [i] = mono_sgen_alloc_internal_dynamic (sizeof (MSBlockInfo*) * num_block_obj_sizes, INTERNAL_MEM_MS_TABLES);
1351
1352         for (i = 0; i < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES; ++i)
1353                 fast_block_obj_size_indexes [i] = ms_find_block_obj_size_index (i * 8);
1354         for (i = 0; i < MS_NUM_FAST_BLOCK_OBJ_SIZE_INDEXES * 8; ++i)
1355                 g_assert (MS_BLOCK_OBJ_SIZE_INDEX (i) == ms_find_block_obj_size_index (i));
1356
1357         LOCK_INIT (ms_block_list_mutex);
1358
1359         mono_counters_register ("# major blocks allocated", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_alloced);
1360         mono_counters_register ("# major blocks freed", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_major_blocks_freed);
1361
1362         collector->section_size = MAJOR_SECTION_SIZE;
1363 #ifdef SGEN_PARALLEL_MARK
1364         collector->is_parallel = TRUE;
1365 #else
1366         collector->is_parallel = FALSE;
1367 #endif
1368         collector->supports_cardtable = !collector->is_parallel;
1369
1370         collector->alloc_heap = major_alloc_heap;
1371         collector->is_object_live = major_is_object_live;
1372         collector->alloc_small_pinned_obj = major_alloc_small_pinned_obj;
1373         collector->alloc_degraded = major_alloc_degraded;
1374         collector->copy_or_mark_object = major_copy_or_mark_object;
1375         collector->alloc_object = major_alloc_object;
1376         collector->free_pinned_object = free_pinned_object;
1377         collector->iterate_objects = major_iterate_objects;
1378         collector->free_non_pinned_object = major_free_non_pinned_object;
1379         collector->find_pin_queue_start_ends = major_find_pin_queue_start_ends;
1380         collector->pin_objects = major_pin_objects;
1381 #ifdef SGEN_HAVE_CARDTABLE
1382         collector->scan_card_table = major_scan_card_table;
1383         collector->iterate_live_block_ranges = (void*)(void*) major_iterate_live_block_ranges;
1384 #endif
1385         collector->init_to_space = major_init_to_space;
1386         collector->sweep = major_sweep;
1387         collector->check_scan_starts = major_check_scan_starts;
1388         collector->dump_heap = major_dump_heap;
1389         collector->get_used_size = major_get_used_size;
1390         collector->start_nursery_collection = major_start_nursery_collection;
1391         collector->finish_nursery_collection = major_finish_nursery_collection;
1392         collector->finish_major_collection = major_finish_major_collection;
1393         collector->ptr_is_in_non_pinned_space = major_ptr_is_in_non_pinned_space;
1394         collector->obj_is_from_pinned_alloc = obj_is_from_pinned_alloc;
1395         collector->report_pinned_memory_usage = major_report_pinned_memory_usage;
1396         collector->get_num_major_sections = get_num_major_sections;
1397 #ifdef FIXED_HEAP
1398         collector->handle_gc_param = major_handle_gc_param;
1399         collector->print_gc_param_usage = major_print_gc_param_usage;
1400 #else
1401         collector->handle_gc_param = NULL;
1402         collector->print_gc_param_usage = NULL;
1403 #endif
1404
1405         FILL_COLLECTOR_COPY_OBJECT (collector);
1406         FILL_COLLECTOR_SCAN_OBJECT (collector);
1407 }
1408
1409 #endif