mono/metadata/sgen-gc.h

   1 /*
   2  * Copyright 2001-2003 Ximian, Inc
   3  * Copyright 2003-2010 Novell, Inc.
   4  * Copyright 2011 Xamarin Inc (http://www.xamarin.com)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be
  15  * included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25 #ifndef __MONO_SGENGC_H__
  26 #define __MONO_SGENGC_H__
  27
  28 /* pthread impl */
  29 #include "config.h"
  30
  31 #ifdef HAVE_SGEN_GC
  32
  33 typedef struct _SgenThreadInfo SgenThreadInfo;
  34 #define THREAD_INFO_TYPE SgenThreadInfo
  35
  36 #include <glib.h>
  37 #ifdef HAVE_PTHREAD_H
  38 #include <pthread.h>
  39 #endif
  40 #include <signal.h>
  41 #include <mono/utils/mono-compiler.h>
  42 #include <mono/utils/mono-threads.h>
  43 #include <mono/io-layer/mono-mutex.h>
  44 #include <mono/metadata/class-internals.h>
  45 #include <mono/metadata/object-internals.h>
  46 #include <mono/metadata/sgen-conf.h>
  47 #include <mono/metadata/sgen-archdep.h>
  48 #include <mono/metadata/sgen-descriptor.h>
  49 #include <mono/metadata/sgen-gray.h>
  50
  51 #if defined(__MACH__)
  52         #include <mach/mach_port.h>
  53 #endif
  54
  55 /* The method used to clear the nursery */
  56 /* Clearing at nursery collections is the safest, but has bad interactions with caches.
  57  * Clearing at TLAB creation is much faster, but more complex and it might expose hard
  58  * to find bugs.
  59  */
  60 typedef enum {
  61         CLEAR_AT_GC,
  62         CLEAR_AT_TLAB_CREATION
  63 } NurseryClearPolicy;
  64
  65 NurseryClearPolicy mono_sgen_get_nursery_clear_policy (void) MONO_INTERNAL;
  66
  67 #define SGEN_TV_DECLARE(name) gint64 name
  68 #define SGEN_TV_GETTIME(tv) tv = mono_100ns_ticks ()
  69 #define SGEN_TV_ELAPSED(start,end) (int)((end-start) / 10)
  70 #define SGEN_TV_ELAPSED_MS(start,end) ((SGEN_TV_ELAPSED((start),(end)) + 500) / 1000)
  71
  72 /* for use with write barriers */
  73 typedef struct _RememberedSet RememberedSet;
  74 struct _RememberedSet {
  75         mword *store_next;
  76         mword *end_set;
  77         RememberedSet *next;
  78         mword data [MONO_ZERO_LEN_ARRAY];
  79 };
  80
  81 /*
  82  * We're never actually using the first element.  It's always set to
  83  * NULL to simplify the elimination of consecutive duplicate
  84  * entries.
  85  */
  86 #define STORE_REMSET_BUFFER_SIZE        1023
  87
  88 typedef struct _GenericStoreRememberedSet GenericStoreRememberedSet;
  89 struct _GenericStoreRememberedSet {
  90         GenericStoreRememberedSet *next;
  91         /* We need one entry less because the first entry of store
  92            remset buffers is always a dummy and we don't copy it. */
  93         gpointer data [STORE_REMSET_BUFFER_SIZE - 1];
  94 };
  95
  96 /* we have 4 possible values in the low 2 bits */
  97 enum {
  98         REMSET_LOCATION, /* just a pointer to the exact location */
  99         REMSET_RANGE,    /* range of pointer fields */
 100         REMSET_OBJECT,   /* mark all the object for scanning */
 101         REMSET_VTYPE,    /* a valuetype array described by a gc descriptor, a count and a size */
 102         REMSET_TYPE_MASK = 0x3
 103 };
 104
 105 /* eventually share with MonoThread? */
 106 struct _SgenThreadInfo {
 107         MonoThreadInfo info;
 108 #if defined(__MACH__)
 109         thread_port_t mach_port;
 110 #else
 111         int signal;
 112         unsigned int stop_count; /* to catch duplicate signals */
 113 #endif
 114         int skip;
 115         volatile int in_critical_region;
 116         gboolean doing_handshake;
 117         gboolean thread_is_dying;
 118         gboolean gc_disabled;
 119         void *stack_end;
 120         void *stack_start;
 121         void *stack_start_limit;
 122         char **tlab_next_addr;
 123         char **tlab_start_addr;
 124         char **tlab_temp_end_addr;
 125         char **tlab_real_end_addr;
 126         gpointer **store_remset_buffer_addr;
 127         long *store_remset_buffer_index_addr;
 128         RememberedSet *remset;
 129         gpointer runtime_data;
 130         gpointer stopped_ip;    /* only valid if the thread is stopped */
 131         MonoDomain *stopped_domain; /* ditto */
 132
 133 #ifdef USE_MONO_CTX
 134 #ifdef __MACH__
 135         MonoContext ctx;                /* ditto */
 136 #endif
 137         MonoContext *monoctx;   /* ditto */
 138
 139 #else
 140
 141 #if defined(__MACH__) || defined(HOST_WIN32)
 142         gpointer regs[ARCH_NUM_REGS];       /* ditto */
 143 #endif
 144         gpointer *stopped_regs;     /* ditto */
 145 #endif
 146
 147 #ifndef HAVE_KW_THREAD
 148         char *tlab_start;
 149         char *tlab_next;
 150         char *tlab_temp_end;
 151         char *tlab_real_end;
 152         gpointer *store_remset_buffer;
 153         long store_remset_buffer_index;
 154 #endif
 155 };
 156
 157 enum {
 158         MEMORY_ROLE_GEN0,
 159         MEMORY_ROLE_GEN1,
 160         MEMORY_ROLE_PINNED
 161 };
 162
 163 typedef struct _SgenBlock SgenBlock;
 164 struct _SgenBlock {
 165         void *next;
 166         unsigned char role;
 167 };
 168
 169 /*
 170  * The nursery section and the major copying collector's sections use
 171  * this struct.
 172  */
 173 typedef struct _GCMemSection GCMemSection;
 174 struct _GCMemSection {
 175         SgenBlock block;
 176         char *data;
 177         mword size;
 178         /* pointer where more data could be allocated if it fits */
 179         char *next_data;
 180         char *end_data;
 181         /*
 182          * scan starts is an array of pointers to objects equally spaced in the allocation area
 183          * They let use quickly find pinned objects from pinning pointers.
 184          */
 185         char **scan_starts;
 186         /* in major collections indexes in the pin_queue for objects that pin this section */
 187         void **pin_queue_start;
 188         int pin_queue_num_entries;
 189         unsigned short num_scan_start;
 190         gboolean is_to_space;
 191 };
 192
 193 #define SGEN_PINNED_CHUNK_FOR_PTR(o)    ((SgenBlock*)(((mword)(o)) & ~(SGEN_PINNED_CHUNK_SIZE - 1)))
 194
 195 typedef struct _SgenPinnedChunk SgenPinnedChunk;
 196
 197 /*
 198  * Recursion is not allowed for the thread lock.
 199  */
 200 #define LOCK_DECLARE(name) mono_mutex_t name
 201 /* if changing LOCK_INIT to something that isn't idempotent, look at
 202    its use in mono_gc_base_init in sgen-gc.c */
 203 #define LOCK_INIT(name) mono_mutex_init (&(name), NULL)
 204 #define LOCK_GC mono_mutex_lock (&gc_mutex)
 205 #define TRYLOCK_GC (mono_mutex_trylock (&gc_mutex) == 0)
 206 #define UNLOCK_GC mono_mutex_unlock (&gc_mutex)
 207 #define LOCK_INTERRUPTION mono_mutex_lock (&interruption_mutex)
 208 #define UNLOCK_INTERRUPTION mono_mutex_unlock (&interruption_mutex)
 209
 210 #define SGEN_CAS_PTR    InterlockedCompareExchangePointer
 211 #define SGEN_ATOMIC_ADD(x,i)    do {                                    \
 212                 int __old_x;                                            \
 213                 do {                                                    \
 214                         __old_x = (x);                                  \
 215                 } while (InterlockedCompareExchange (&(x), __old_x + (i), __old_x) != __old_x); \
 216         } while (0)
 217
 218 #ifndef HOST_WIN32
 219 /* we intercept pthread_create calls to know which threads exist */
 220 #define USE_PTHREAD_INTERCEPT 1
 221 #endif
 222
 223 #ifdef HEAVY_STATISTICS
 224 #define HEAVY_STAT(x)   x
 225
 226 extern long long stat_objects_alloced_degraded;
 227 extern long long stat_bytes_alloced_degraded;
 228 extern long long stat_copy_object_called_major;
 229 extern long long stat_objects_copied_major;
 230 #else
 231 #define HEAVY_STAT(x)
 232 #endif
 233
 234 #define DEBUG(level,a) do {if (G_UNLIKELY ((level) <= SGEN_MAX_DEBUG_LEVEL && (level) <= gc_debug_level)) { a; fflush (gc_debug_file); } } while (0)
 235
 236 extern int gc_debug_level;
 237 extern FILE* gc_debug_file;
 238
 239 extern int current_collection_generation;
 240
 241 extern unsigned int mono_sgen_global_stop_count;
 242
 243 #define SGEN_ALLOC_ALIGN                8
 244 #define SGEN_ALLOC_ALIGN_BITS   3
 245
 246 #define SGEN_ALIGN_UP(s)                (((s)+(SGEN_ALLOC_ALIGN-1)) & ~(SGEN_ALLOC_ALIGN-1))
 247
 248 #ifdef SGEN_ALIGN_NURSERY
 249 #define SGEN_PTR_IN_NURSERY(p,bits,start,end)   (((mword)(p) & ~((1 << (bits)) - 1)) == (mword)(start))
 250 #else
 251 #define SGEN_PTR_IN_NURSERY(p,bits,start,end)   ((char*)(p) >= (start) && (char*)(p) < (end))
 252 #endif
 253
 254 #ifdef USER_CONFIG
 255
 256 /* good sizes are 512KB-1MB: larger ones increase a lot memzeroing time */
 257 #define DEFAULT_NURSERY_SIZE (mono_sgen_nursery_size)
 258 extern int mono_sgen_nursery_size MONO_INTERNAL;
 259 #ifdef SGEN_ALIGN_NURSERY
 260 /* The number of trailing 0 bits in DEFAULT_NURSERY_SIZE */
 261 #define DEFAULT_NURSERY_BITS (mono_sgen_nursery_bits)
 262 extern int mono_sgen_nursery_bits MONO_INTERNAL;
 263 #endif
 264
 265 #else
 266
 267 #define DEFAULT_NURSERY_SIZE (4*1024*1024)
 268 #ifdef SGEN_ALIGN_NURSERY
 269 #define DEFAULT_NURSERY_BITS 22
 270 #endif
 271
 272 #endif
 273
 274 #ifndef SGEN_ALIGN_NURSERY
 275 #define DEFAULT_NURSERY_BITS -1
 276 #endif
 277
 278 extern char *mono_sgen_nursery_start MONO_INTERNAL;
 279 extern char *mono_sgen_nursery_end MONO_INTERNAL;
 280
 281 static inline gboolean
 282 mono_sgen_ptr_in_nursery (void *p)
 283 {
 284         return SGEN_PTR_IN_NURSERY ((p), DEFAULT_NURSERY_BITS, mono_sgen_nursery_start, mono_sgen_nursery_end);
 285 }
 286
 287 static inline char*
 288 mono_sgen_get_nursery_start (void)
 289 {
 290         return mono_sgen_nursery_start;
 291 }
 292
 293 static inline char*
 294 mono_sgen_get_nursery_end (void)
 295 {
 296         return mono_sgen_nursery_end;
 297 }
 298
 299
 300 /* Structure that corresponds to a MonoVTable: desc is a mword so requires
 301  * no cast from a pointer to an integer
 302  */
 303 typedef struct {
 304         MonoClass *klass;
 305         mword desc;
 306 } GCVTable;
 307
 308 /* these bits are set in the object vtable: we could merge them since an object can be
 309  * either pinned or forwarded but not both.
 310  * We store them in the vtable slot because the bits are used in the sync block for
 311  * other purposes: if we merge them and alloc the sync blocks aligned to 8 bytes, we can change
 312  * this and use bit 3 in the syncblock (with the lower two bits both set for forwarded, that
 313  * would be an invalid combination for the monitor and hash code).
 314  * The values are already shifted.
 315  * The forwarding address is stored in the sync block.
 316  */
 317 #define SGEN_FORWARDED_BIT 1
 318 #define SGEN_PINNED_BIT 2
 319 #define SGEN_VTABLE_BITS_MASK 0x3
 320
 321 /* returns NULL if not forwarded, or the forwarded address */
 322 #define SGEN_OBJECT_IS_FORWARDED(obj) (((mword*)(obj))[0] & SGEN_FORWARDED_BIT ? (void*)(((mword*)(obj))[0] & ~SGEN_VTABLE_BITS_MASK) : NULL)
 323 #define SGEN_OBJECT_IS_PINNED(obj) (((mword*)(obj))[0] & SGEN_PINNED_BIT)
 324
 325 /* set the forwarded address fw_addr for object obj */
 326 #define SGEN_FORWARD_OBJECT(obj,fw_addr) do {                           \
 327                 ((mword*)(obj))[0] = (mword)(fw_addr) | SGEN_FORWARDED_BIT; \
 328         } while (0)
 329 #define SGEN_PIN_OBJECT(obj) do {       \
 330                 ((mword*)(obj))[0] |= SGEN_PINNED_BIT;  \
 331         } while (0)
 332 #define SGEN_UNPIN_OBJECT(obj) do {     \
 333                 ((mword*)(obj))[0] &= ~SGEN_PINNED_BIT; \
 334         } while (0)
 335
 336 /*
 337  * Since we set bits in the vtable, use the macro to load it from the pointer to
 338  * an object that is potentially pinned.
 339  */
 340 #define SGEN_LOAD_VTABLE(addr) ((*(mword*)(addr)) & ~SGEN_VTABLE_BITS_MASK)
 341
 342 typedef void (*CopyOrMarkObjectFunc) (void**, SgenGrayQueue*);
 343 typedef void (*ScanObjectFunc) (char*, SgenGrayQueue*);
 344 typedef void (*ScanVTypeFunc) (char*, mword desc, SgenGrayQueue*);
 345
 346 #if SGEN_MAX_DEBUG_LEVEL >= 9
 347 #define GRAY_OBJECT_ENQUEUE mono_sgen_gray_object_enqueue
 348 #define GRAY_OBJECT_DEQUEUE(queue,o) ((o) = mono_sgen_gray_object_dequeue ((queue)))
 349 #else
 350 #define GRAY_OBJECT_ENQUEUE(queue,o) do {                               \
 351                 if (G_UNLIKELY (!(queue)->first || (queue)->first->end == SGEN_GRAY_QUEUE_SECTION_SIZE)) \
 352                         mono_sgen_gray_object_enqueue ((queue), (o));   \
 353                 else                                                    \
 354                         (queue)->first->objects [(queue)->first->end++] = (o); \
 355                 PREFETCH ((o));                                         \
 356         } while (0)
 357 #define GRAY_OBJECT_DEQUEUE(queue,o) do {                               \
 358                 if (!(queue)->first)                                    \
 359                         (o) = NULL;                                     \
 360                 else if (G_UNLIKELY ((queue)->first->end == 1))         \
 361                         (o) = mono_sgen_gray_object_dequeue ((queue));          \
 362                 else                                                    \
 363                         (o) = (queue)->first->objects [--(queue)->first->end]; \
 364         } while (0)
 365 #endif
 366
 367 /*
 368 List of what each bit on of the vtable gc bits means.
 369 */
 370 enum {
 371         SGEN_GC_BIT_BRIDGE_OBJECT = 1,
 372 };
 373
 374 typedef void (*IterateObjectCallbackFunc) (char*, size_t, void*);
 375
 376 void* mono_sgen_alloc_os_memory (size_t size, int activate) MONO_INTERNAL;
 377 void* mono_sgen_alloc_os_memory_aligned (mword size, mword alignment, gboolean activate) MONO_INTERNAL;
 378 void mono_sgen_free_os_memory (void *addr, size_t size) MONO_INTERNAL;
 379
 380 int mono_sgen_thread_handshake (BOOL suspend) MONO_INTERNAL;
 381 gboolean mono_sgen_suspend_thread (SgenThreadInfo *info) MONO_INTERNAL;
 382 gboolean mono_sgen_resume_thread (SgenThreadInfo *info) MONO_INTERNAL;
 383 void mono_sgen_wait_for_suspend_ack (int count) MONO_INTERNAL;
 384 gboolean mono_sgen_park_current_thread_if_doing_handshake (SgenThreadInfo *p) MONO_INTERNAL;
 385 void mono_sgen_os_init (void) MONO_INTERNAL;
 386
 387 void mono_sgen_fill_thread_info_for_suspend (SgenThreadInfo *info) MONO_INTERNAL;
 388
 389 gboolean mono_sgen_is_worker_thread (MonoNativeThreadId thread) MONO_INTERNAL;
 390
 391 void mono_sgen_update_heap_boundaries (mword low, mword high) MONO_INTERNAL;
 392
 393 void mono_sgen_register_major_sections_alloced (int num_sections) MONO_INTERNAL;
 394 mword mono_sgen_get_minor_collection_allowance (void) MONO_INTERNAL;
 395
 396 void mono_sgen_scan_area_with_callback (char *start, char *end, IterateObjectCallbackFunc callback, void *data, gboolean allow_flags) MONO_INTERNAL;
 397 void mono_sgen_check_section_scan_starts (GCMemSection *section) MONO_INTERNAL;
 398
 399 /* Keep in sync with mono_sgen_dump_internal_mem_usage() in dump_heap()! */
 400 enum {
 401         INTERNAL_MEM_PIN_QUEUE,
 402         INTERNAL_MEM_FRAGMENT,
 403         INTERNAL_MEM_SECTION,
 404         INTERNAL_MEM_SCAN_STARTS,
 405         INTERNAL_MEM_FIN_TABLE,
 406         INTERNAL_MEM_FINALIZE_ENTRY,
 407         INTERNAL_MEM_FINALIZE_READY_ENTRY,
 408         INTERNAL_MEM_DISLINK_TABLE,
 409         INTERNAL_MEM_DISLINK,
 410         INTERNAL_MEM_ROOTS_TABLE,
 411         INTERNAL_MEM_ROOT_RECORD,
 412         INTERNAL_MEM_STATISTICS,
 413         INTERNAL_MEM_STAT_PINNED_CLASS,
 414         INTERNAL_MEM_STAT_REMSET_CLASS,
 415         INTERNAL_MEM_REMSET,
 416         INTERNAL_MEM_GRAY_QUEUE,
 417         INTERNAL_MEM_STORE_REMSET,
 418         INTERNAL_MEM_MS_TABLES,
 419         INTERNAL_MEM_MS_BLOCK_INFO,
 420         INTERNAL_MEM_EPHEMERON_LINK,
 421         INTERNAL_MEM_WORKER_DATA,
 422         INTERNAL_MEM_BRIDGE_DATA,
 423         INTERNAL_MEM_JOB_QUEUE_ENTRY,
 424         INTERNAL_MEM_TOGGLEREF_DATA,
 425         INTERNAL_MEM_MAX
 426 };
 427
 428 #define SGEN_PINNED_FREELIST_NUM_SLOTS  30
 429
 430 typedef struct {
 431         SgenPinnedChunk *chunk_list;
 432         SgenPinnedChunk *free_lists [SGEN_PINNED_FREELIST_NUM_SLOTS];
 433         void *delayed_free_lists [SGEN_PINNED_FREELIST_NUM_SLOTS];
 434 } SgenPinnedAllocator;
 435
 436 enum {
 437         GENERATION_NURSERY,
 438         GENERATION_OLD,
 439         GENERATION_MAX
 440 };
 441
 442 void mono_sgen_init_internal_allocator (void) MONO_INTERNAL;
 443 void mono_sgen_init_pinned_allocator (void) MONO_INTERNAL;
 444
 445 typedef struct _ObjectList ObjectList;
 446 struct _ObjectList {
 447         MonoObject *obj;
 448         ObjectList *next;
 449 };
 450
 451 void mono_sgen_report_internal_mem_usage (void) MONO_INTERNAL;
 452 void mono_sgen_report_pinned_mem_usage (SgenPinnedAllocator *alc) MONO_INTERNAL;
 453 void mono_sgen_dump_internal_mem_usage (FILE *heap_dump_file) MONO_INTERNAL;
 454 void mono_sgen_dump_section (GCMemSection *section, const char *type) MONO_INTERNAL;
 455 void mono_sgen_dump_occupied (char *start, char *end, char *section_start) MONO_INTERNAL;
 456
 457 void mono_sgen_register_moved_object (void *obj, void *destination) MONO_INTERNAL;
 458
 459 void mono_sgen_register_fixed_internal_mem_type (int type, size_t size) MONO_INTERNAL;
 460
 461 void* mono_sgen_alloc_internal (int type) MONO_INTERNAL;
 462 void mono_sgen_free_internal (void *addr, int type) MONO_INTERNAL;
 463
 464 void* mono_sgen_alloc_internal_dynamic (size_t size, int type) MONO_INTERNAL;
 465 void mono_sgen_free_internal_dynamic (void *addr, size_t size, int type) MONO_INTERNAL;
 466
 467 void* mono_sgen_alloc_pinned (SgenPinnedAllocator *allocator, size_t size) MONO_INTERNAL;
 468 void mono_sgen_free_pinned (SgenPinnedAllocator *allocator, void *addr, size_t size) MONO_INTERNAL;
 469
 470
 471 void mono_sgen_debug_printf (int level, const char *format, ...) MONO_INTERNAL;
 472
 473 gboolean mono_sgen_parse_environment_string_extract_number (const char *str, glong *out) MONO_INTERNAL;
 474
 475 void mono_sgen_pinned_scan_objects (SgenPinnedAllocator *alc, IterateObjectCallbackFunc callback, void *callback_data) MONO_INTERNAL;
 476 void mono_sgen_pinned_scan_pinned_objects (SgenPinnedAllocator *alc, IterateObjectCallbackFunc callback, void *callback_data) MONO_INTERNAL;
 477
 478 void mono_sgen_pinned_update_heap_boundaries (SgenPinnedAllocator *alc) MONO_INTERNAL;
 479
 480 void** mono_sgen_find_optimized_pin_queue_area (void *start, void *end, int *num) MONO_INTERNAL;
 481 void mono_sgen_find_section_pin_queue_start_end (GCMemSection *section) MONO_INTERNAL;
 482 void mono_sgen_pin_objects_in_section (GCMemSection *section, SgenGrayQueue *queue) MONO_INTERNAL;
 483
 484 void mono_sgen_pin_stats_register_object (char *obj, size_t size);
 485 void mono_sgen_pin_stats_register_global_remset (char *obj);
 486 void mono_sgen_pin_stats_print_class_stats (void);
 487
 488 void mono_sgen_sort_addresses (void **array, int size) MONO_INTERNAL;
 489 void mono_sgen_add_to_global_remset (gpointer ptr) MONO_INTERNAL;
 490
 491 int mono_sgen_get_current_collection_generation (void) MONO_INTERNAL;
 492 gboolean mono_sgen_nursery_collection_is_parallel (void) MONO_INTERNAL;
 493 CopyOrMarkObjectFunc mono_sgen_get_copy_object (void) MONO_INTERNAL;
 494 ScanObjectFunc mono_sgen_get_minor_scan_object (void) MONO_INTERNAL;
 495 ScanVTypeFunc mono_sgen_get_minor_scan_vtype (void) MONO_INTERNAL;
 496 gboolean mono_sgen_collection_is_parallel (void) MONO_INTERNAL;
 497
 498
 499 typedef void (*sgen_cardtable_block_callback) (mword start, mword size);
 500 void sgen_major_collector_iterate_live_block_ranges (sgen_cardtable_block_callback callback) MONO_INTERNAL;
 501
 502 typedef struct _SgenMajorCollector SgenMajorCollector;
 503 struct _SgenMajorCollector {
 504         size_t section_size;
 505         gboolean is_parallel;
 506         gboolean supports_cardtable;
 507
 508         /*
 509          * This is set to TRUE if the sweep for the last major
 510          * collection has been completed.
 511          */
 512         gboolean *have_swept;
 513
 514         void* (*alloc_heap) (mword nursery_size, mword nursery_align, int nursery_bits);
 515         gboolean (*is_object_live) (char *obj);
 516         void* (*alloc_small_pinned_obj) (size_t size, gboolean has_references);
 517         void* (*alloc_degraded) (MonoVTable *vtable, size_t size);
 518         void (*copy_or_mark_object) (void **obj_slot, SgenGrayQueue *queue);
 519         void (*minor_scan_object) (char *start, SgenGrayQueue *queue);
 520         void (*nopar_minor_scan_object) (char *start, SgenGrayQueue *queue);
 521         void (*minor_scan_vtype) (char *start, mword desc, SgenGrayQueue *queue);
 522         void (*nopar_minor_scan_vtype) (char *start, mword desc, SgenGrayQueue *queue);
 523         void (*major_scan_object) (char *start, SgenGrayQueue *queue);
 524         void (*copy_object) (void **obj_slot, SgenGrayQueue *queue);
 525         void (*nopar_copy_object) (void **obj_slot, SgenGrayQueue *queue);
 526         void* (*alloc_object) (int size, gboolean has_references);
 527         void (*free_pinned_object) (char *obj, size_t size);
 528         void (*iterate_objects) (gboolean non_pinned, gboolean pinned, IterateObjectCallbackFunc callback, void *data);
 529         void (*free_non_pinned_object) (char *obj, size_t size);
 530         void (*find_pin_queue_start_ends) (SgenGrayQueue *queue);
 531         void (*pin_objects) (SgenGrayQueue *queue);
 532         void (*scan_card_table) (SgenGrayQueue *queue);
 533         void (*iterate_live_block_ranges) (sgen_cardtable_block_callback callback);
 534         void (*init_to_space) (void);
 535         void (*sweep) (void);
 536         void (*check_scan_starts) (void);
 537         void (*dump_heap) (FILE *heap_dump_file);
 538         gint64 (*get_used_size) (void);
 539         void (*start_nursery_collection) (void);
 540         void (*finish_nursery_collection) (void);
 541         void (*start_major_collection) (void);
 542         void (*finish_major_collection) (void);
 543         void (*have_computed_minor_collection_allowance) (void);
 544         gboolean (*ptr_is_in_non_pinned_space) (char *ptr);
 545         gboolean (*obj_is_from_pinned_alloc) (char *obj);
 546         void (*report_pinned_memory_usage) (void);
 547         int (*get_num_major_sections) (void);
 548         gboolean (*handle_gc_param) (const char *opt);
 549         void (*print_gc_param_usage) (void);
 550         gboolean (*is_worker_thread) (MonoNativeThreadId thread);
 551         void (*post_param_init) (void);
 552         void* (*alloc_worker_data) (void);
 553         void (*init_worker_thread) (void *data);
 554         void (*reset_worker_data) (void *data);
 555 };
 556
 557 extern SgenMajorCollector major_collector;
 558
 559 void mono_sgen_marksweep_init (SgenMajorCollector *collector) MONO_INTERNAL;
 560 void mono_sgen_marksweep_fixed_init (SgenMajorCollector *collector) MONO_INTERNAL;
 561 void mono_sgen_marksweep_par_init (SgenMajorCollector *collector) MONO_INTERNAL;
 562 void mono_sgen_marksweep_fixed_par_init (SgenMajorCollector *collector) MONO_INTERNAL;
 563 void mono_sgen_copying_init (SgenMajorCollector *collector) MONO_INTERNAL;
 564 SgenMajorCollector* mono_sgen_get_major_collector (void) MONO_INTERNAL;
 565
 566
 567 typedef struct {
 568         void (*wbarrier_set_field) (MonoObject *obj, gpointer field_ptr, MonoObject* value);
 569         void (*wbarrier_set_arrayref) (MonoArray *arr, gpointer slot_ptr, MonoObject* value);
 570         void (*wbarrier_arrayref_copy) (gpointer dest_ptr, gpointer src_ptr, int count);
 571         void (*wbarrier_value_copy) (gpointer dest, gpointer src, int count, MonoClass *klass);
 572         void (*wbarrier_object_copy) (MonoObject* obj, MonoObject *src);
 573         void (*wbarrier_generic_nostore) (gpointer ptr);
 574         void (*record_pointer) (gpointer ptr);
 575
 576         void (*begin_scan_remsets) (void *start_nursery, void *end_nursery, SgenGrayQueue *queue); /* OPTIONAL */
 577         void (*finish_scan_remsets) (void *start_nursery, void *end_nursery, SgenGrayQueue *queue);
 578
 579         void (*register_thread) (SgenThreadInfo *p); /* OPTIONAL */
 580         void (*cleanup_thread) (SgenThreadInfo *p); /* OPTIONAL */
 581         void (*fill_thread_info_for_suspend) (SgenThreadInfo *info); /* OPTIONAL */
 582         void (*prepare_for_minor_collection) (void); /* OPTIONAL */
 583         void (*prepare_for_major_collection) (void);
 584
 585         void (*finish_minor_collection) (void); /* OPTIONAL */
 586         gboolean (*find_address) (char *addr);
 587 } SgenRemeberedSet;
 588
 589 SgenRemeberedSet *mono_sgen_get_remset (void) MONO_INTERNAL;
 590
 591 static guint /*__attribute__((noinline)) not sure if this hint is a good idea*/
 592 slow_object_get_size (MonoVTable *vtable, MonoObject* o)
 593 {
 594         MonoClass *klass = vtable->klass;
 595
 596         /*
 597          * We depend on mono_string_length_fast and
 598          * mono_array_length_fast not using the object's vtable.
 599          */
 600         if (klass == mono_defaults.string_class) {
 601                 return sizeof (MonoString) + 2 * mono_string_length_fast ((MonoString*) o) + 2;
 602         } else if (klass->rank) {
 603                 MonoArray *array = (MonoArray*)o;
 604                 size_t size = sizeof (MonoArray) + klass->sizes.element_size * mono_array_length_fast (array);
 605                 if (G_UNLIKELY (array->bounds)) {
 606                         size += sizeof (mono_array_size_t) - 1;
 607                         size &= ~(sizeof (mono_array_size_t) - 1);
 608                         size += sizeof (MonoArrayBounds) * klass->rank;
 609                 }
 610                 return size;
 611         } else {
 612                 /* from a created object: the class must be inited already */
 613                 return klass->instance_size;
 614         }
 615 }
 616
 617 /*
 618  * This function can be called on an object whose first word, the
 619  * vtable field, is not intact.  This is necessary for the parallel
 620  * collector.
 621  */
 622 static inline guint
 623 mono_sgen_par_object_get_size (MonoVTable *vtable, MonoObject* o)
 624 {
 625         mword descr = (mword)vtable->gc_descr;
 626         mword type = descr & 0x7;
 627
 628         if (type == DESC_TYPE_RUN_LENGTH || type == DESC_TYPE_SMALL_BITMAP) {
 629                 mword size = descr & 0xfff8;
 630                 if (size == 0) /* This is used to encode a string */
 631                         return sizeof (MonoString) + 2 * mono_string_length_fast ((MonoString*) o) + 2;
 632                 return size;
 633         } else if (type == DESC_TYPE_VECTOR) {
 634                 int element_size = ((descr) >> VECTOR_ELSIZE_SHIFT) & MAX_ELEMENT_SIZE;
 635                 MonoArray *array = (MonoArray*)o;
 636                 size_t size = sizeof (MonoArray) + element_size * mono_array_length_fast (array);
 637
 638                 if (descr & VECTOR_KIND_ARRAY) {
 639                         size += sizeof (mono_array_size_t) - 1;
 640                         size &= ~(sizeof (mono_array_size_t) - 1);
 641                         size += sizeof (MonoArrayBounds) * vtable->klass->rank;
 642                 }
 643                 return size;
 644         }
 645
 646         return slow_object_get_size (vtable, o);
 647 }
 648
 649 static inline guint
 650 mono_sgen_safe_object_get_size (MonoObject *obj)
 651 {
 652        char *forwarded;
 653
 654        if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj)))
 655                obj = (MonoObject*)forwarded;
 656
 657        return mono_sgen_par_object_get_size ((MonoVTable*)SGEN_LOAD_VTABLE (obj), obj);
 658 }
 659
 660 const char* mono_sgen_safe_name (void* obj) MONO_INTERNAL;
 661
 662 gboolean mono_sgen_object_is_live (void *obj) MONO_INTERNAL;
 663
 664 gboolean mono_sgen_need_bridge_processing (void) MONO_INTERNAL;
 665 void mono_sgen_bridge_reset_data (void) MONO_INTERNAL;
 666 void mono_sgen_bridge_processing_stw_step (void) MONO_INTERNAL;
 667 void mono_sgen_bridge_processing_finish (void) MONO_INTERNAL;
 668 void mono_sgen_register_test_bridge_callbacks (const char *bridge_class_name) MONO_INTERNAL;
 669 gboolean mono_sgen_is_bridge_object (MonoObject *obj) MONO_INTERNAL;
 670 gboolean mono_sgen_is_bridge_class (MonoClass *class) MONO_INTERNAL;
 671 void mono_sgen_mark_bridge_object (MonoObject *obj) MONO_INTERNAL;
 672 void mono_sgen_bridge_register_finalized_object (MonoObject *object) MONO_INTERNAL;
 673
 674 void mono_sgen_scan_togglerefs (CopyOrMarkObjectFunc copy_func, char *start, char *end, SgenGrayQueue *queue) MONO_INTERNAL;
 675 void mono_sgen_process_togglerefs (void) MONO_INTERNAL;
 676
 677
 678 gboolean mono_sgen_gc_is_object_ready_for_finalization (void *object) MONO_INTERNAL;
 679 void mono_sgen_gc_lock (void) MONO_INTERNAL;
 680 void mono_sgen_gc_unlock (void) MONO_INTERNAL;
 681
 682 enum {
 683         SPACE_MAJOR,
 684         SPACE_LOS
 685 };
 686
 687 gboolean mono_sgen_try_alloc_space (mword size, int space) MONO_INTERNAL;
 688 void mono_sgen_release_space (mword size, int space) MONO_INTERNAL;
 689 void mono_sgen_pin_object (void *object, SgenGrayQueue *queue) MONO_INTERNAL;
 690 void sgen_collect_major_no_lock (const char *reason) MONO_INTERNAL;
 691 void mono_sgen_collect_nursery_no_lock (size_t requested_size) MONO_INTERNAL;
 692 void mono_sgen_minor_collect_or_expand_inner (size_t size) MONO_INTERNAL;
 693 gboolean mono_sgen_need_major_collection (mword space_needed) MONO_INTERNAL;
 694 void mono_sgen_set_pinned_from_failed_allocation (mword objsize) MONO_INTERNAL;
 695
 696 /* LOS */
 697
 698 typedef struct _LOSObject LOSObject;
 699 struct _LOSObject {
 700         LOSObject *next;
 701         mword size; /* this is the object size */
 702         guint16 huge_object;
 703         int dummy; /* to have a sizeof (LOSObject) a multiple of ALLOC_ALIGN  and data starting at same alignment */
 704         char data [MONO_ZERO_LEN_ARRAY];
 705 };
 706
 707 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
 708
 709 extern LOSObject *los_object_list;
 710 extern mword los_memory_usage;
 711
 712 void mono_sgen_los_free_object (LOSObject *obj) MONO_INTERNAL;
 713 void* mono_sgen_los_alloc_large_inner (MonoVTable *vtable, size_t size) MONO_INTERNAL;
 714 void mono_sgen_los_sweep (void) MONO_INTERNAL;
 715 gboolean mono_sgen_ptr_is_in_los (char *ptr, char **start) MONO_INTERNAL;
 716 void mono_sgen_los_iterate_objects (IterateObjectCallbackFunc cb, void *user_data) MONO_INTERNAL;
 717 void mono_sgen_los_iterate_live_block_ranges (sgen_cardtable_block_callback callback) MONO_INTERNAL;
 718 void mono_sgen_los_scan_card_table (SgenGrayQueue *queue) MONO_INTERNAL;
 719 void sgen_major_collector_scan_card_table (SgenGrayQueue *queue) MONO_INTERNAL;
 720 FILE *mono_sgen_get_logfile (void) MONO_INTERNAL;
 721
 722 /* nursery allocator */
 723
 724 void mono_sgen_clear_nursery_fragments (void) MONO_INTERNAL;
 725 void mono_sgen_nursery_allocator_prepare_for_pinning (void) MONO_INTERNAL;
 726 void mono_sgen_clear_current_nursery_fragment (void) MONO_INTERNAL;
 727 void mono_sgen_nursery_allocator_set_nursery_bounds (char *nursery_start, char *nursery_end) MONO_INTERNAL;
 728 mword mono_sgen_build_nursery_fragments (GCMemSection *nursery_section, void **start, int num_entries) MONO_INTERNAL;
 729 void mono_sgen_init_nursery_allocator (void) MONO_INTERNAL;
 730 void mono_sgen_nursery_allocator_init_heavy_stats (void) MONO_INTERNAL;
 731 void mono_sgen_alloc_init_heavy_stats (void) MONO_INTERNAL;
 732 char* mono_sgen_nursery_alloc_get_upper_alloc_bound (void) MONO_INTERNAL;
 733 void* mono_sgen_nursery_alloc (size_t size) MONO_INTERNAL;
 734 void* mono_sgen_nursery_alloc_range (size_t size, size_t min_size, int *out_alloc_size) MONO_INTERNAL;
 735 MonoVTable* mono_sgen_get_array_fill_vtable (void) MONO_INTERNAL;
 736 gboolean mono_sgen_can_alloc_size (size_t size) MONO_INTERNAL;
 737 void mono_sgen_nursery_retire_region (void *address, ptrdiff_t size) MONO_INTERNAL;
 738
 739 /* hash tables */
 740
 741 typedef struct _SgenHashTableEntry SgenHashTableEntry;
 742 struct _SgenHashTableEntry {
 743         SgenHashTableEntry *next;
 744         gpointer key;
 745         char data [MONO_ZERO_LEN_ARRAY]; /* data is pointer-aligned */
 746 };
 747
 748 typedef struct {
 749         int table_mem_type;
 750         int entry_mem_type;
 751         size_t data_size;
 752         GHashFunc hash_func;
 753         GEqualFunc equal_func;
 754         SgenHashTableEntry **table;
 755         guint size;
 756         guint num_entries;
 757 } SgenHashTable;
 758
 759 #define SGEN_HASH_TABLE_INIT(table_type,entry_type,data_size,hash_func,equal_func)      { (table_type), (entry_type), (data_size), (hash_func), (equal_func), NULL, 0, 0 }
 760 #define SGEN_HASH_TABLE_ENTRY_SIZE(data_size)                   ((data_size) + sizeof (SgenHashTableEntry*) + sizeof (gpointer))
 761
 762 gpointer mono_sgen_hash_table_lookup (SgenHashTable *table, gpointer key) MONO_INTERNAL;
 763 gboolean mono_sgen_hash_table_replace (SgenHashTable *table, gpointer key, gpointer data) MONO_INTERNAL;
 764 gboolean mono_sgen_hash_table_set_value (SgenHashTable *table, gpointer key, gpointer data) MONO_INTERNAL;
 765 gboolean mono_sgen_hash_table_set_key (SgenHashTable *hash_table, gpointer old_key, gpointer new_key) MONO_INTERNAL;
 766 gboolean mono_sgen_hash_table_remove (SgenHashTable *table, gpointer key, gpointer data_return) MONO_INTERNAL;
 767
 768 void mono_sgen_hash_table_clean (SgenHashTable *table) MONO_INTERNAL;
 769
 770 #define mono_sgen_hash_table_num_entries(h)     ((h)->num_entries)
 771
 772 #define SGEN_HASH_TABLE_FOREACH(h,k,v) do {                             \
 773                 SgenHashTable *__hash_table = (h);                      \
 774                 SgenHashTableEntry **__table = __hash_table->table;     \
 775                 guint __i;                                              \
 776                 for (__i = 0; __i < (h)->size; ++__i) {                 \
 777                         SgenHashTableEntry **__iter, **__next;                  \
 778                         for (__iter = &__table [__i]; *__iter; __iter = __next) {       \
 779                                 SgenHashTableEntry *__entry = *__iter;  \
 780                                 __next = &__entry->next;        \
 781                                 (k) = __entry->key;                     \
 782                                 (v) = (gpointer)__entry->data;
 783
 784 /* The loop must be continue'd after using this! */
 785 #define SGEN_HASH_TABLE_FOREACH_REMOVE(free)    do {                    \
 786                 *__iter = *__next;      \
 787                 __next = __iter;        \
 788                 --__hash_table->num_entries;                            \
 789                 if ((free))                                             \
 790                         mono_sgen_free_internal (__entry, __hash_table->entry_mem_type); \
 791         } while (0)
 792
 793 #define SGEN_HASH_TABLE_FOREACH_SET_KEY(k)      ((__entry)->key = (k))
 794
 795 #define SGEN_HASH_TABLE_FOREACH_END                                     \
 796                         }                                               \
 797                 }                                                       \
 798         } while (0)
 799
 800 /* TLS Data */
 801
 802 extern MonoNativeTlsKey thread_info_key;
 803
 804 #ifdef HAVE_KW_THREAD
 805 extern __thread SgenThreadInfo *thread_info;
 806 extern __thread gpointer *store_remset_buffer;
 807 extern __thread long store_remset_buffer_index;
 808 extern __thread char *stack_end;
 809 extern __thread long *store_remset_buffer_index_addr;
 810 #endif
 811
 812 #ifdef HAVE_KW_THREAD
 813 #define TLAB_ACCESS_INIT
 814 #define REMEMBERED_SET  remembered_set
 815 #define STORE_REMSET_BUFFER     store_remset_buffer
 816 #define STORE_REMSET_BUFFER_INDEX       store_remset_buffer_index
 817 #define IN_CRITICAL_REGION thread_info->in_critical_region
 818 #else
 819 #define TLAB_ACCESS_INIT        SgenThreadInfo *__thread_info__ = mono_native_tls_get_value (thread_info_key)
 820 #define REMEMBERED_SET  (__thread_info__->remset)
 821 #define STORE_REMSET_BUFFER     (__thread_info__->store_remset_buffer)
 822 #define STORE_REMSET_BUFFER_INDEX       (__thread_info__->store_remset_buffer_index)
 823 #define IN_CRITICAL_REGION (__thread_info__->in_critical_region)
 824 #endif
 825
 826 #ifndef DISABLE_CRITICAL_REGION
 827
 828 #ifdef HAVE_KW_THREAD
 829 #define IN_CRITICAL_REGION thread_info->in_critical_region
 830 #else
 831 #define IN_CRITICAL_REGION (__thread_info__->in_critical_region)
 832 #endif
 833
 834 /* Enter must be visible before anything is done in the critical region. */
 835 #define ENTER_CRITICAL_REGION do { mono_atomic_store_acquire (&IN_CRITICAL_REGION, 1); } while (0)
 836
 837 /* Exit must make sure all critical regions stores are visible before it signal the end of the region.
 838  * We don't need to emit a full barrier since we
 839  */
 840 #define EXIT_CRITICAL_REGION  do { mono_atomic_store_release (&IN_CRITICAL_REGION, 0); } while (0)
 841
 842 #endif
 843
 844 #ifdef HAVE_KW_THREAD
 845 #define EMIT_TLS_ACCESS(mb,dummy,offset)        do {    \
 846         mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX);   \
 847         mono_mb_emit_byte ((mb), CEE_MONO_TLS);         \
 848         mono_mb_emit_i4 ((mb), (offset));               \
 849         } while (0)
 850 #else
 851
 852 /*
 853  * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
 854  * where the two are the same.
 855  */
 856 #if defined(__APPLE__) || defined (HOST_WIN32)
 857 #define EMIT_TLS_ACCESS(mb,member,dummy)        do {    \
 858         mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX);   \
 859         mono_mb_emit_byte ((mb), CEE_MONO_TLS);         \
 860         mono_mb_emit_i4 ((mb), thread_info_key);        \
 861         mono_mb_emit_icon ((mb), G_STRUCT_OFFSET (SgenThreadInfo, member));     \
 862         mono_mb_emit_byte ((mb), CEE_ADD);              \
 863         mono_mb_emit_byte ((mb), CEE_LDIND_I);          \
 864         } while (0)
 865 #else
 866 #define EMIT_TLS_ACCESS(mb,member,dummy)        do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
 867 #endif
 868
 869 #endif
 870
 871 /* Other globals */
 872
 873 extern GCMemSection *nursery_section;
 874 extern int stat_major_gcs;
 875 extern guint32 collect_before_allocs;
 876 extern int degraded_mode;
 877 extern int default_nursery_size;
 878 extern guint32 tlab_size;
 879 extern NurseryClearPolicy nursery_clear_policy;
 880
 881 extern LOCK_DECLARE (gc_mutex);
 882
 883 extern int do_pin_stats;
 884
 885 /* Object Allocation */
 886
 887 typedef enum {
 888         ATYPE_NORMAL,
 889         ATYPE_VECTOR,
 890         ATYPE_SMALL,
 891         ATYPE_NUM
 892 } SgenAllocatorType;
 893
 894 void mono_sgen_init_tlab_info (SgenThreadInfo* info);
 895 void mono_sgen_clear_tlabs (void);
 896 gboolean mono_sgen_is_managed_allocator (MonoMethod *method);
 897
 898 /* Debug support */
 899
 900 void mono_sgen_check_consistency (void);
 901 void mono_sgen_check_major_refs (void);
 902
 903
 904 /* Write barrier support */
 905
 906 /*
 907  * This causes the compile to extend the liveness of 'v' till the call to dummy_use
 908  */
 909 static inline void
 910 mono_sgen_dummy_use (gpointer v) {
 911 #if defined(__GNUC__)
 912         __asm__ volatile ("" : "=r"(v) : "r"(v));
 913 #elif defined(_MSC_VER)
 914         __asm {
 915                 mov eax, v;
 916                 and eax, eax;
 917         };
 918 #else
 919 #error "Implement mono_sgen_dummy_use for your compiler"
 920 #endif
 921 }
 922
 923 #endif /* HAVE_SGEN_GC */
 924
 925 #endif /* __MONO_SGENGC_H__ */