2 * sgen-gc.c: Simple generational GC.
4 * Copyright 2001-2003 Ximian, Inc
5 * Copyright 2003-2010 Novell, Inc.
6 * Copyright 2011 Xamarin Inc (http://www.xamarin.com)
7 * Copyright (C) 2012 Xamarin Inc
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License 2.0 as published by the Free Software Foundation;
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License 2.0 along with this library; if not, write to the Free
20 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #ifndef __MONO_SGENGC_H__
23 #define __MONO_SGENGC_H__
30 typedef struct _SgenThreadInfo SgenThreadInfo;
31 #define THREAD_INFO_TYPE SgenThreadInfo
38 #include <mono/utils/mono-compiler.h>
39 #include <mono/utils/mono-threads.h>
40 #include <mono/utils/dtrace.h>
41 #include <mono/utils/mono-logger-internal.h>
42 #include <mono/utils/atomic.h>
43 #include <mono/utils/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 #include <mono/metadata/sgen-hash-table.h>
51 #include <mono/metadata/sgen-bridge.h>
52 #include <mono/metadata/sgen-protocol.h>
54 /* The method used to clear the nursery */
55 /* Clearing at nursery collections is the safest, but has bad interactions with caches.
56 * Clearing at TLAB creation is much faster, but more complex and it might expose hard
61 CLEAR_AT_TLAB_CREATION,
62 CLEAR_AT_TLAB_CREATION_DEBUG
65 NurseryClearPolicy sgen_get_nursery_clear_policy (void) MONO_INTERNAL;
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))
70 #define SGEN_TV_ELAPSED_MS(start,end) ((SGEN_TV_ELAPSED((start),(end)) + 5000) / 10000)
72 #if !defined(__MACH__) && !MONO_MACH_ARCH_SUPPORTED && defined(HAVE_PTHREAD_KILL)
73 #define SGEN_POSIX_STW 1
76 /* eventually share with MonoThread? */
78 * This structure extends the MonoThreadInfo structure.
80 struct _SgenThreadInfo {
83 This is set to TRUE when STW fails to suspend a thread, most probably because the
84 underlying thread is dead.
87 volatile int in_critical_region;
90 This is set the argument of mono_gc_set_skip_thread.
92 A thread that knowingly holds no managed state can call this
93 function around blocking loops to reduce the GC burden by not
99 void *stack_start_limit;
100 char **tlab_next_addr;
101 char **tlab_start_addr;
102 char **tlab_temp_end_addr;
103 char **tlab_real_end_addr;
104 gpointer runtime_data;
106 #ifdef SGEN_POSIX_STW
107 /* This is -1 until the first suspend. */
109 /* FIXME: kill this, we only use signals on systems that have rt-posix, which doesn't have issues with duplicates. */
110 unsigned int stop_count; /* to catch duplicate signals. */
113 gpointer stopped_ip; /* only valid if the thread is stopped */
114 MonoDomain *stopped_domain; /* dsto */
116 /*FIXME pretty please finish killing ARCH_NUM_REGS */
118 MonoContext ctx; /* ditto */
120 gpointer regs[ARCH_NUM_REGS]; /* ditto */
123 #ifndef HAVE_KW_THREAD
132 * The nursery section uses this struct.
134 typedef struct _GCMemSection GCMemSection;
135 struct _GCMemSection {
138 /* pointer where more data could be allocated if it fits */
142 * scan starts is an array of pointers to objects equally spaced in the allocation area
143 * They let use quickly find pinned objects from pinning pointers.
146 /* in major collections indexes in the pin_queue for objects that pin this section */
147 void **pin_queue_start;
148 size_t pin_queue_num_entries;
149 size_t num_scan_start;
153 * Recursion is not allowed for the thread lock.
155 #define LOCK_DECLARE(name) mono_mutex_t name
156 /* if changing LOCK_INIT to something that isn't idempotent, look at
157 its use in mono_gc_base_init in sgen-gc.c */
158 #define LOCK_INIT(name) mono_mutex_init (&(name))
159 #define LOCK_GC do { \
160 mono_mutex_lock (&gc_mutex); \
163 #define TRYLOCK_GC (mono_mutex_trylock (&gc_mutex) == 0)
164 #define UNLOCK_GC do { sgen_gc_unlock (); } while (0)
166 extern LOCK_DECLARE (sgen_interruption_mutex);
168 #define LOCK_INTERRUPTION mono_mutex_lock (&sgen_interruption_mutex)
169 #define UNLOCK_INTERRUPTION mono_mutex_unlock (&sgen_interruption_mutex)
171 /* FIXME: Use InterlockedAdd & InterlockedAdd64 to reduce the CAS cost. */
172 #define SGEN_CAS_PTR InterlockedCompareExchangePointer
173 #define SGEN_ATOMIC_ADD(x,i) do { \
177 } while (InterlockedCompareExchange (&(x), __old_x + (i), __old_x) != __old_x); \
179 #define SGEN_ATOMIC_ADD_P(x,i) do { \
183 } while (InterlockedCompareExchangePointer ((void**)&(x), (void*)(__old_x + (i)), (void*)__old_x) != (void*)__old_x); \
188 /* we intercept pthread_create calls to know which threads exist */
189 #define USE_PTHREAD_INTERCEPT 1
192 #ifdef HEAVY_STATISTICS
193 #define HEAVY_STAT(x) x
195 extern long long stat_objects_alloced_degraded;
196 extern long long stat_bytes_alloced_degraded;
197 extern long long stat_copy_object_called_major;
198 extern long long stat_objects_copied_major;
200 #define HEAVY_STAT(x)
203 #define SGEN_ASSERT(level, a, ...) do { \
204 if (G_UNLIKELY ((level) <= SGEN_MAX_ASSERT_LEVEL && !(a))) { \
205 g_error (__VA_ARGS__); \
209 #define SGEN_LOG(level, format, ...) do { \
210 if (G_UNLIKELY ((level) <= SGEN_MAX_DEBUG_LEVEL && (level) <= gc_debug_level)) { \
211 mono_gc_printf (gc_debug_file, format, ##__VA_ARGS__); \
214 #define SGEN_COND_LOG(level, cond, format, ...) do { \
215 if (G_UNLIKELY ((level) <= SGEN_MAX_DEBUG_LEVEL && (level) <= gc_debug_level)) { \
217 mono_gc_printf (gc_debug_file, format, ##__VA_ARGS__); \
220 #define SGEN_LOG_DO(level, fun) do { \
221 if (G_UNLIKELY ((level) <= SGEN_MAX_DEBUG_LEVEL && (level) <= gc_debug_level)) { \
225 extern int gc_debug_level;
226 extern FILE* gc_debug_file;
228 extern int current_collection_generation;
230 extern unsigned int sgen_global_stop_count;
232 extern gboolean bridge_processing_in_progress;
233 extern MonoGCBridgeCallbacks bridge_callbacks;
235 extern int num_ready_finalizers;
237 #define SGEN_ALLOC_ALIGN 8
238 #define SGEN_ALLOC_ALIGN_BITS 3
240 /* s must be non-negative */
241 #define SGEN_CAN_ALIGN_UP(s) ((s) <= SIZE_MAX - (SGEN_ALLOC_ALIGN - 1))
242 #define SGEN_ALIGN_UP(s) (((s)+(SGEN_ALLOC_ALIGN-1)) & ~(SGEN_ALLOC_ALIGN-1))
244 #if SIZEOF_VOID_P == 4
251 * The link pointer is hidden by negating each bit. We use the lowest
252 * bit of the link (before negation) to store whether it needs
253 * resurrection tracking.
255 #define HIDE_POINTER(p,t) ((gpointer)(~((size_t)(p)|((t)?1:0))))
256 #define REVEAL_POINTER(p) ((gpointer)((~(size_t)(p))&~3L))
258 #ifdef SGEN_ALIGN_NURSERY
259 #define SGEN_PTR_IN_NURSERY(p,bits,start,end) (((mword)(p) & ~((1 << (bits)) - 1)) == (mword)(start))
261 #define SGEN_PTR_IN_NURSERY(p,bits,start,end) ((char*)(p) >= (start) && (char*)(p) < (end))
266 /* good sizes are 512KB-1MB: larger ones increase a lot memzeroing time */
267 #define DEFAULT_NURSERY_SIZE (sgen_nursery_size)
268 extern size_t sgen_nursery_size MONO_INTERNAL;
269 #ifdef SGEN_ALIGN_NURSERY
270 /* The number of trailing 0 bits in DEFAULT_NURSERY_SIZE */
271 #define DEFAULT_NURSERY_BITS (sgen_nursery_bits)
272 extern int sgen_nursery_bits MONO_INTERNAL;
277 #define DEFAULT_NURSERY_SIZE (4*1024*1024)
278 #ifdef SGEN_ALIGN_NURSERY
279 #define DEFAULT_NURSERY_BITS 22
284 #ifndef SGEN_ALIGN_NURSERY
285 #define DEFAULT_NURSERY_BITS -1
288 extern char *sgen_nursery_start MONO_INTERNAL;
289 extern char *sgen_nursery_end MONO_INTERNAL;
291 static inline MONO_ALWAYS_INLINE gboolean
292 sgen_ptr_in_nursery (void *p)
294 return SGEN_PTR_IN_NURSERY ((p), DEFAULT_NURSERY_BITS, sgen_nursery_start, sgen_nursery_end);
297 static inline MONO_ALWAYS_INLINE char*
298 sgen_get_nursery_start (void)
300 return sgen_nursery_start;
303 static inline MONO_ALWAYS_INLINE char*
304 sgen_get_nursery_end (void)
306 return sgen_nursery_end;
309 /* Structure that corresponds to a MonoVTable: desc is a mword so requires
310 * no cast from a pointer to an integer
317 /* these bits are set in the object vtable: we could merge them since an object can be
318 * either pinned or forwarded but not both.
319 * We store them in the vtable slot because the bits are used in the sync block for
320 * other purposes: if we merge them and alloc the sync blocks aligned to 8 bytes, we can change
321 * this and use bit 3 in the syncblock (with the lower two bits both set for forwarded, that
322 * would be an invalid combination for the monitor and hash code).
323 * The values are already shifted.
324 * The forwarding address is stored in the sync block.
326 #define SGEN_FORWARDED_BIT 1
327 #define SGEN_PINNED_BIT 2
328 #define SGEN_VTABLE_BITS_MASK 0x3
330 /* returns NULL if not forwarded, or the forwarded address */
331 #define SGEN_OBJECT_IS_FORWARDED(obj) (((mword*)(obj))[0] & SGEN_FORWARDED_BIT ? (void*)(((mword*)(obj))[0] & ~SGEN_VTABLE_BITS_MASK) : NULL)
332 #define SGEN_OBJECT_IS_PINNED(obj) (((mword*)(obj))[0] & SGEN_PINNED_BIT)
334 /* set the forwarded address fw_addr for object obj */
335 #define SGEN_FORWARD_OBJECT(obj,fw_addr) do { \
336 ((mword*)(obj))[0] = (mword)(fw_addr) | SGEN_FORWARDED_BIT; \
338 #define SGEN_PIN_OBJECT(obj) do { \
339 ((mword*)(obj))[0] |= SGEN_PINNED_BIT; \
341 #define SGEN_UNPIN_OBJECT(obj) do { \
342 ((mword*)(obj))[0] &= ~SGEN_PINNED_BIT; \
346 * Since we set bits in the vtable, use the macro to load it from the pointer to
347 * an object that is potentially pinned.
349 #define SGEN_LOAD_VTABLE(addr) ((*(mword*)(addr)) & ~SGEN_VTABLE_BITS_MASK)
351 static inline MONO_ALWAYS_INLINE void
352 GRAY_OBJECT_ENQUEUE (SgenGrayQueue *queue, char* obj)
354 #if defined(SGEN_GRAY_OBJECT_ENQUEUE) || SGEN_MAX_DEBUG_LEVEL >= 9
355 sgen_gray_object_enqueue (queue, obj);
357 if (G_UNLIKELY (!queue->first || queue->cursor == GRAY_LAST_CURSOR_POSITION (queue->first))) {
358 sgen_gray_object_enqueue (queue, obj);
360 HEAVY_STAT (gc_stats.gray_queue_enqueue_fast_path ++);
362 *++queue->cursor = obj;
363 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
364 binary_protocol_gray_enqueue (queue, queue->cursor, obj);
372 static inline MONO_ALWAYS_INLINE void
373 GRAY_OBJECT_DEQUEUE (SgenGrayQueue *queue, char** obj)
375 #if defined(SGEN_GRAY_OBJECT_ENQUEUE) || SGEN_MAX_DEBUG_LEVEL >= 9
376 *obj = sgen_gray_object_enqueue (queue);
379 HEAVY_STAT (gc_stats.gray_queue_dequeue_fast_path ++);
382 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
383 binary_protocol_gray_dequeue (queue, queue->cursor, *obj);
385 } else if (G_UNLIKELY (queue->cursor == GRAY_FIRST_CURSOR_POSITION (queue->first))) {
386 *obj = sgen_gray_object_dequeue (queue);
388 HEAVY_STAT (gc_stats.gray_queue_dequeue_fast_path ++);
390 *obj = *queue->cursor--;
391 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
392 binary_protocol_gray_dequeue (queue, queue->cursor + 1, *obj);
399 List of what each bit on of the vtable gc bits means.
402 SGEN_GC_BIT_BRIDGE_OBJECT = 1,
403 SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT = 2,
404 SGEN_GC_BIT_FINALIZER_AWARE = 4,
407 /* the runtime can register areas of memory as roots: we keep two lists of roots,
408 * a pinned root set for conservatively scanned roots and a normal one for
409 * precisely scanned roots (currently implemented as a single list).
411 typedef struct _RootRecord RootRecord;
418 ROOT_TYPE_NORMAL = 0, /* "normal" roots */
419 ROOT_TYPE_PINNED = 1, /* roots without a GC descriptor */
420 ROOT_TYPE_WBARRIER = 2, /* roots with a write barrier */
424 extern SgenHashTable roots_hash [ROOT_TYPE_NUM];
426 typedef void (*IterateObjectCallbackFunc) (char*, size_t, void*);
428 int sgen_thread_handshake (BOOL suspend) MONO_INTERNAL;
429 gboolean sgen_suspend_thread (SgenThreadInfo *info) MONO_INTERNAL;
430 gboolean sgen_resume_thread (SgenThreadInfo *info) MONO_INTERNAL;
431 void sgen_wait_for_suspend_ack (int count) MONO_INTERNAL;
432 void sgen_os_init (void) MONO_INTERNAL;
434 gboolean sgen_is_worker_thread (MonoNativeThreadId thread) MONO_INTERNAL;
436 void sgen_update_heap_boundaries (mword low, mword high) MONO_INTERNAL;
438 void sgen_scan_area_with_callback (char *start, char *end, IterateObjectCallbackFunc callback, void *data, gboolean allow_flags) MONO_INTERNAL;
439 void sgen_check_section_scan_starts (GCMemSection *section) MONO_INTERNAL;
441 /* Keep in sync with description_for_type() in sgen-internal.c! */
443 INTERNAL_MEM_PIN_QUEUE,
444 INTERNAL_MEM_FRAGMENT,
445 INTERNAL_MEM_SECTION,
446 INTERNAL_MEM_SCAN_STARTS,
447 INTERNAL_MEM_FIN_TABLE,
448 INTERNAL_MEM_FINALIZE_ENTRY,
449 INTERNAL_MEM_FINALIZE_READY_ENTRY,
450 INTERNAL_MEM_DISLINK_TABLE,
451 INTERNAL_MEM_DISLINK,
452 INTERNAL_MEM_ROOTS_TABLE,
453 INTERNAL_MEM_ROOT_RECORD,
454 INTERNAL_MEM_STATISTICS,
455 INTERNAL_MEM_STAT_PINNED_CLASS,
456 INTERNAL_MEM_STAT_REMSET_CLASS,
457 INTERNAL_MEM_GRAY_QUEUE,
458 INTERNAL_MEM_MS_TABLES,
459 INTERNAL_MEM_MS_BLOCK_INFO,
460 INTERNAL_MEM_MS_BLOCK_INFO_SORT,
461 INTERNAL_MEM_EPHEMERON_LINK,
462 INTERNAL_MEM_WORKER_DATA,
463 INTERNAL_MEM_WORKER_JOB_DATA,
464 INTERNAL_MEM_BRIDGE_DATA,
465 INTERNAL_MEM_OLD_BRIDGE_HASH_TABLE,
466 INTERNAL_MEM_OLD_BRIDGE_HASH_TABLE_ENTRY,
467 INTERNAL_MEM_BRIDGE_HASH_TABLE,
468 INTERNAL_MEM_BRIDGE_HASH_TABLE_ENTRY,
469 INTERNAL_MEM_BRIDGE_ALIVE_HASH_TABLE,
470 INTERNAL_MEM_BRIDGE_ALIVE_HASH_TABLE_ENTRY,
471 INTERNAL_MEM_TARJAN_BRIDGE_HASH_TABLE,
472 INTERNAL_MEM_TARJAN_BRIDGE_HASH_TABLE_ENTRY,
473 INTERNAL_MEM_TARJAN_OBJ_BUCKET,
474 INTERNAL_MEM_BRIDGE_DEBUG,
475 INTERNAL_MEM_JOB_QUEUE_ENTRY,
476 INTERNAL_MEM_TOGGLEREF_DATA,
477 INTERNAL_MEM_CARDTABLE_MOD_UNION,
478 INTERNAL_MEM_BINARY_PROTOCOL,
488 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
489 #define BINARY_PROTOCOL_ARG(x) ,x
491 #define BINARY_PROTOCOL_ARG(x)
494 void sgen_init_internal_allocator (void) MONO_INTERNAL;
496 typedef struct _ObjectList ObjectList;
502 typedef void (*CopyOrMarkObjectFunc) (void**, SgenGrayQueue*);
503 typedef void (*ScanObjectFunc) (char*, SgenGrayQueue*);
504 typedef void (*ScanVTypeFunc) (char*, mword desc, SgenGrayQueue* BINARY_PROTOCOL_ARG (size_t size));
508 ScanObjectFunc scan_func;
509 CopyOrMarkObjectFunc copy_func;
510 SgenGrayQueue *queue;
513 void sgen_report_internal_mem_usage (void) MONO_INTERNAL;
514 void sgen_dump_internal_mem_usage (FILE *heap_dump_file) MONO_INTERNAL;
515 void sgen_dump_section (GCMemSection *section, const char *type) MONO_INTERNAL;
516 void sgen_dump_occupied (char *start, char *end, char *section_start) MONO_INTERNAL;
518 void sgen_register_moved_object (void *obj, void *destination) MONO_INTERNAL;
520 void sgen_register_fixed_internal_mem_type (int type, size_t size) MONO_INTERNAL;
522 void* sgen_alloc_internal (int type) MONO_INTERNAL;
523 void sgen_free_internal (void *addr, int type) MONO_INTERNAL;
525 void* sgen_alloc_internal_dynamic (size_t size, int type, gboolean assert_on_failure) MONO_INTERNAL;
526 void sgen_free_internal_dynamic (void *addr, size_t size, int type) MONO_INTERNAL;
528 void** sgen_find_optimized_pin_queue_area (void *start, void *end, size_t *num) MONO_INTERNAL;
529 void sgen_find_section_pin_queue_start_end (GCMemSection *section) MONO_INTERNAL;
530 void sgen_pin_objects_in_section (GCMemSection *section, ScanCopyContext ctx) MONO_INTERNAL;
532 void sgen_pin_stats_register_object (char *obj, size_t size);
533 void sgen_pin_stats_register_global_remset (char *obj);
534 void sgen_pin_stats_print_class_stats (void);
536 void sgen_sort_addresses (void **array, size_t size) MONO_INTERNAL;
537 void sgen_add_to_global_remset (gpointer ptr, gpointer obj) MONO_INTERNAL;
539 int sgen_get_current_collection_generation (void) MONO_INTERNAL;
540 gboolean sgen_collection_is_parallel (void) MONO_INTERNAL;
541 gboolean sgen_collection_is_concurrent (void) MONO_INTERNAL;
542 gboolean sgen_concurrent_collection_in_progress (void) MONO_INTERNAL;
545 CopyOrMarkObjectFunc copy_or_mark_object;
546 ScanObjectFunc scan_object;
547 ScanVTypeFunc scan_vtype;
548 /*FIXME add allocation function? */
549 } SgenObjectOperations;
551 SgenObjectOperations *sgen_get_current_object_ops (void) MONO_INTERNAL;
553 typedef struct _SgenFragment SgenFragment;
555 struct _SgenFragment {
557 char *fragment_start;
558 char *fragment_next; /* the current soft limit for allocation */
560 SgenFragment *next_in_order; /* We use a different entry for all active fragments so we can avoid SMR. */
564 SgenFragment *alloc_head; /* List head to be used when allocating memory. Walk with fragment_next. */
565 SgenFragment *region_head; /* List head of the region used by this allocator. Walk with next_in_order. */
566 } SgenFragmentAllocator;
568 void sgen_fragment_allocator_add (SgenFragmentAllocator *allocator, char *start, char *end) MONO_INTERNAL;
569 void sgen_fragment_allocator_release (SgenFragmentAllocator *allocator) MONO_INTERNAL;
570 void* sgen_fragment_allocator_serial_alloc (SgenFragmentAllocator *allocator, size_t size) MONO_INTERNAL;
571 void* sgen_fragment_allocator_par_alloc (SgenFragmentAllocator *allocator, size_t size) MONO_INTERNAL;
572 void* sgen_fragment_allocator_serial_range_alloc (SgenFragmentAllocator *allocator, size_t desired_size, size_t minimum_size, size_t *out_alloc_size) MONO_INTERNAL;
573 void* sgen_fragment_allocator_par_range_alloc (SgenFragmentAllocator *allocator, size_t desired_size, size_t minimum_size, size_t *out_alloc_size) MONO_INTERNAL;
574 SgenFragment* sgen_fragment_allocator_alloc (void) MONO_INTERNAL;
575 void sgen_clear_allocator_fragments (SgenFragmentAllocator *allocator) MONO_INTERNAL;
576 void sgen_clear_range (char *start, char *end) MONO_INTERNAL;
580 This is a space/speed compromise as we need to make sure the from/to space check is both O(1)
581 and only hit cache hot memory. On a 4Mb nursery it requires 1024 bytes, or 3% of your average
582 L1 cache. On small configs with a 512kb nursery, this goes to 0.4%.
584 Experimental results on how much space we waste with a 4Mb nursery:
586 Note that the wastage applies to the half nursery, or 2Mb:
588 Test 1 (compiling corlib):
593 #define SGEN_TO_SPACE_GRANULE_BITS 9
594 #define SGEN_TO_SPACE_GRANULE_IN_BYTES (1 << SGEN_TO_SPACE_GRANULE_BITS)
596 extern char *sgen_space_bitmap MONO_INTERNAL;
597 extern size_t sgen_space_bitmap_size MONO_INTERNAL;
599 static inline gboolean
600 sgen_nursery_is_to_space (char *object)
602 size_t idx = (object - sgen_nursery_start) >> SGEN_TO_SPACE_GRANULE_BITS;
603 size_t byte = idx / 8;
604 size_t bit = idx & 0x7;
606 SGEN_ASSERT (4, sgen_ptr_in_nursery (object), "object %p is not in nursery [%p - %p]", object, sgen_get_nursery_start (), sgen_get_nursery_end ());
607 SGEN_ASSERT (4, byte < sgen_space_bitmap_size, "byte index %d out of range", byte, sgen_space_bitmap_size);
609 return (sgen_space_bitmap [byte] & (1 << bit)) != 0;
612 static inline gboolean
613 sgen_nursery_is_from_space (char *object)
615 return !sgen_nursery_is_to_space (object);
618 static inline gboolean
619 sgen_nursery_is_object_alive (char *obj)
621 /* FIXME put this asserts under a non default level */
622 g_assert (sgen_ptr_in_nursery (obj));
624 if (sgen_nursery_is_to_space (obj))
627 if (SGEN_OBJECT_IS_PINNED (obj) || SGEN_OBJECT_IS_FORWARDED (obj))
636 char* (*alloc_for_promotion) (MonoVTable *vtable, char *obj, size_t objsize, gboolean has_references);
637 char* (*par_alloc_for_promotion) (MonoVTable *vtable, char *obj, size_t objsize, gboolean has_references);
639 SgenObjectOperations serial_ops;
640 SgenObjectOperations parallel_ops;
642 void (*prepare_to_space) (char *to_space_bitmap, size_t space_bitmap_size);
643 void (*clear_fragments) (void);
644 SgenFragment* (*build_fragments_get_exclude_head) (void);
645 void (*build_fragments_release_exclude_head) (void);
646 void (*build_fragments_finish) (SgenFragmentAllocator *allocator);
647 void (*init_nursery) (SgenFragmentAllocator *allocator, char *start, char *end);
649 gboolean (*handle_gc_param) (const char *opt); /* Optional */
650 void (*print_gc_param_usage) (void); /* Optional */
651 } SgenMinorCollector;
653 extern SgenMinorCollector sgen_minor_collector;
655 void sgen_simple_nursery_init (SgenMinorCollector *collector) MONO_INTERNAL;
656 void sgen_split_nursery_init (SgenMinorCollector *collector) MONO_INTERNAL;
658 typedef void (*sgen_cardtable_block_callback) (mword start, mword size);
659 void sgen_major_collector_iterate_live_block_ranges (sgen_cardtable_block_callback callback) MONO_INTERNAL;
662 ITERATE_OBJECTS_SWEEP = 1,
663 ITERATE_OBJECTS_NON_PINNED = 2,
664 ITERATE_OBJECTS_PINNED = 4,
665 ITERATE_OBJECTS_ALL = ITERATE_OBJECTS_NON_PINNED | ITERATE_OBJECTS_PINNED,
666 ITERATE_OBJECTS_SWEEP_NON_PINNED = ITERATE_OBJECTS_SWEEP | ITERATE_OBJECTS_NON_PINNED,
667 ITERATE_OBJECTS_SWEEP_PINNED = ITERATE_OBJECTS_SWEEP | ITERATE_OBJECTS_PINNED,
668 ITERATE_OBJECTS_SWEEP_ALL = ITERATE_OBJECTS_SWEEP | ITERATE_OBJECTS_NON_PINNED | ITERATE_OBJECTS_PINNED
669 } IterateObjectsFlags;
671 typedef struct _SgenMajorCollector SgenMajorCollector;
672 struct _SgenMajorCollector {
674 gboolean is_parallel;
675 gboolean is_concurrent;
676 gboolean supports_cardtable;
677 gboolean sweeps_lazily;
680 * This is set to TRUE if the sweep for the last major
681 * collection has been completed.
683 gboolean *have_swept;
685 * This is set to TRUE by the sweep if the next major
686 * collection should be synchronous (for evacuation). For
687 * non-concurrent collectors, this should be NULL.
689 gboolean *want_synchronous_collection;
691 void* (*alloc_heap) (mword nursery_size, mword nursery_align, int nursery_bits);
692 gboolean (*is_object_live) (char *obj);
693 void* (*alloc_small_pinned_obj) (MonoVTable *vtable, size_t size, gboolean has_references);
694 void* (*alloc_degraded) (MonoVTable *vtable, size_t size);
696 SgenObjectOperations major_ops;
697 SgenObjectOperations major_concurrent_ops;
699 void* (*alloc_object) (MonoVTable *vtable, size_t size, gboolean has_references);
700 void* (*par_alloc_object) (MonoVTable *vtable, size_t size, gboolean has_references);
701 void (*free_pinned_object) (char *obj, size_t size);
702 void (*iterate_objects) (IterateObjectsFlags flags, IterateObjectCallbackFunc callback, void *data);
703 void (*free_non_pinned_object) (char *obj, size_t size);
704 void (*find_pin_queue_start_ends) (SgenGrayQueue *queue);
705 void (*pin_objects) (SgenGrayQueue *queue);
706 void (*pin_major_object) (char *obj, SgenGrayQueue *queue);
707 void (*scan_card_table) (gboolean mod_union, SgenGrayQueue *queue);
708 void (*iterate_live_block_ranges) (sgen_cardtable_block_callback callback);
709 void (*update_cardtable_mod_union) (void);
710 void (*init_to_space) (void);
711 void (*sweep) (void);
712 void (*check_scan_starts) (void);
713 void (*dump_heap) (FILE *heap_dump_file);
714 gint64 (*get_used_size) (void);
715 void (*start_nursery_collection) (void);
716 void (*finish_nursery_collection) (void);
717 void (*start_major_collection) (void);
718 void (*finish_major_collection) (void);
719 void (*have_computed_minor_collection_allowance) (void);
720 gboolean (*ptr_is_in_non_pinned_space) (char *ptr, char **start);
721 gboolean (*obj_is_from_pinned_alloc) (char *obj);
722 void (*report_pinned_memory_usage) (void);
723 size_t (*get_num_major_sections) (void);
724 gboolean (*handle_gc_param) (const char *opt);
725 void (*print_gc_param_usage) (void);
726 gboolean (*is_worker_thread) (MonoNativeThreadId thread);
727 void (*post_param_init) (SgenMajorCollector *collector);
728 void* (*alloc_worker_data) (void);
729 void (*init_worker_thread) (void *data);
730 void (*reset_worker_data) (void *data);
731 gboolean (*is_valid_object) (char *object);
732 MonoVTable* (*describe_pointer) (char *pointer);
733 guint8* (*get_cardtable_mod_union_for_object) (char *object);
734 long long (*get_and_reset_num_major_objects_marked) (void);
735 void (*count_cards) (long long *num_total_cards, long long *num_marked_cards);
738 extern SgenMajorCollector major_collector;
740 void sgen_marksweep_init (SgenMajorCollector *collector) MONO_INTERNAL;
741 void sgen_marksweep_fixed_init (SgenMajorCollector *collector) MONO_INTERNAL;
742 void sgen_marksweep_par_init (SgenMajorCollector *collector) MONO_INTERNAL;
743 void sgen_marksweep_fixed_par_init (SgenMajorCollector *collector) MONO_INTERNAL;
744 void sgen_marksweep_conc_init (SgenMajorCollector *collector) MONO_INTERNAL;
745 SgenMajorCollector* sgen_get_major_collector (void) MONO_INTERNAL;
748 typedef struct _SgenRemeberedSet {
749 void (*wbarrier_set_field) (MonoObject *obj, gpointer field_ptr, MonoObject* value);
750 void (*wbarrier_set_arrayref) (MonoArray *arr, gpointer slot_ptr, MonoObject* value);
751 void (*wbarrier_arrayref_copy) (gpointer dest_ptr, gpointer src_ptr, int count);
752 void (*wbarrier_value_copy) (gpointer dest, gpointer src, int count, MonoClass *klass);
753 void (*wbarrier_object_copy) (MonoObject* obj, MonoObject *src);
754 void (*wbarrier_generic_nostore) (gpointer ptr);
755 void (*record_pointer) (gpointer ptr);
757 void (*finish_scan_remsets) (void *start_nursery, void *end_nursery, SgenGrayQueue *queue);
759 void (*prepare_for_major_collection) (void);
761 void (*finish_minor_collection) (void);
762 gboolean (*find_address) (char *addr);
763 gboolean (*find_address_with_cards) (char *cards_start, guint8 *cards, char *addr);
766 SgenRemeberedSet *sgen_get_remset (void) MONO_INTERNAL;
768 static mword /*__attribute__((noinline)) not sure if this hint is a good idea*/
769 slow_object_get_size (MonoVTable *vtable, MonoObject* o)
771 MonoClass *klass = vtable->klass;
774 * We depend on mono_string_length_fast and
775 * mono_array_length_fast not using the object's vtable.
777 if (klass == mono_defaults.string_class) {
778 return sizeof (MonoString) + 2 * mono_string_length_fast ((MonoString*) o) + 2;
779 } else if (klass->rank) {
780 MonoArray *array = (MonoArray*)o;
781 size_t size = sizeof (MonoArray) + klass->sizes.element_size * mono_array_length_fast (array);
782 if (G_UNLIKELY (array->bounds)) {
783 size += sizeof (mono_array_size_t) - 1;
784 size &= ~(sizeof (mono_array_size_t) - 1);
785 size += sizeof (MonoArrayBounds) * klass->rank;
789 /* from a created object: the class must be inited already */
790 return klass->instance_size;
795 * This function can be called on an object whose first word, the
796 * vtable field, is not intact. This is necessary for the parallel
800 sgen_par_object_get_size (MonoVTable *vtable, MonoObject* o)
802 mword descr = (mword)vtable->gc_descr;
803 mword type = descr & 0x7;
805 if (type == DESC_TYPE_RUN_LENGTH || type == DESC_TYPE_SMALL_BITMAP) {
806 mword size = descr & 0xfff8;
807 if (size == 0) /* This is used to encode a string */
808 return sizeof (MonoString) + 2 * mono_string_length_fast ((MonoString*) o) + 2;
810 } else if (type == DESC_TYPE_VECTOR) {
811 int element_size = ((descr) >> VECTOR_ELSIZE_SHIFT) & MAX_ELEMENT_SIZE;
812 MonoArray *array = (MonoArray*)o;
813 size_t size = sizeof (MonoArray) + element_size * mono_array_length_fast (array);
815 if (descr & VECTOR_KIND_ARRAY) {
816 size += sizeof (mono_array_size_t) - 1;
817 size &= ~(sizeof (mono_array_size_t) - 1);
818 size += sizeof (MonoArrayBounds) * vtable->klass->rank;
823 return slow_object_get_size (vtable, o);
827 sgen_safe_object_get_size (MonoObject *obj)
831 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj)))
832 obj = (MonoObject*)forwarded;
834 return sgen_par_object_get_size ((MonoVTable*)SGEN_LOAD_VTABLE (obj), obj);
837 const char* sgen_safe_name (void* obj) MONO_INTERNAL;
839 gboolean sgen_object_is_live (void *obj) MONO_INTERNAL;
841 void sgen_init_fin_weak_hash (void) MONO_INTERNAL;
843 gboolean sgen_need_bridge_processing (void) MONO_INTERNAL;
844 void sgen_bridge_reset_data (void) MONO_INTERNAL;
845 void sgen_bridge_processing_stw_step (void) MONO_INTERNAL;
846 void sgen_bridge_processing_finish (int generation) MONO_INTERNAL;
847 void sgen_register_test_bridge_callbacks (const char *bridge_class_name) MONO_INTERNAL;
848 gboolean sgen_is_bridge_object (MonoObject *obj) MONO_INTERNAL;
849 MonoGCBridgeObjectKind sgen_bridge_class_kind (MonoClass *klass) MONO_INTERNAL;
850 void sgen_mark_bridge_object (MonoObject *obj) MONO_INTERNAL;
851 void sgen_bridge_register_finalized_object (MonoObject *object) MONO_INTERNAL;
852 void sgen_bridge_describe_pointer (MonoObject *object) MONO_INTERNAL;
854 void sgen_mark_togglerefs (char *start, char *end, ScanCopyContext ctx) MONO_INTERNAL;
855 void sgen_clear_togglerefs (char *start, char *end, ScanCopyContext ctx) MONO_INTERNAL;
857 void sgen_process_togglerefs (void) MONO_INTERNAL;
858 void sgen_register_test_toggleref_callback (void) MONO_INTERNAL;
860 gboolean sgen_is_bridge_object (MonoObject *obj) MONO_INTERNAL;
861 void sgen_mark_bridge_object (MonoObject *obj) MONO_INTERNAL;
863 gboolean sgen_bridge_handle_gc_debug (const char *opt) MONO_INTERNAL;
864 void sgen_bridge_print_gc_debug_usage (void) MONO_INTERNAL;
867 void (*reset_data) (void);
868 void (*processing_stw_step) (void);
869 void (*processing_build_callback_data) (int generation);
870 void (*processing_after_callback) (int generation);
871 MonoGCBridgeObjectKind (*class_kind) (MonoClass *class);
872 void (*register_finalized_object) (MonoObject *object);
873 void (*describe_pointer) (MonoObject *object);
874 void (*enable_accounting) (void);
875 void (*set_dump_prefix) (const char *prefix);
878 * These are set by processing_build_callback_data().
881 MonoGCBridgeSCC **api_sccs;
884 MonoGCBridgeXRef *api_xrefs;
885 } SgenBridgeProcessor;
887 void sgen_old_bridge_init (SgenBridgeProcessor *collector) MONO_INTERNAL;
888 void sgen_new_bridge_init (SgenBridgeProcessor *collector) MONO_INTERNAL;
889 void sgen_tarjan_bridge_init (SgenBridgeProcessor *collector) MONO_INTERNAL;
890 void sgen_set_bridge_implementation (const char *name) MONO_INTERNAL;
891 void sgen_bridge_set_dump_prefix (const char *prefix) MONO_INTERNAL;
893 gboolean sgen_compare_bridge_processor_results (SgenBridgeProcessor *a, SgenBridgeProcessor *b) MONO_INTERNAL;
895 typedef mono_bool (*WeakLinkAlivePredicateFunc) (MonoObject*, void*);
897 void sgen_null_links_with_predicate (int generation, WeakLinkAlivePredicateFunc predicate, void *data) MONO_INTERNAL;
899 gboolean sgen_gc_is_object_ready_for_finalization (void *object) MONO_INTERNAL;
900 void sgen_gc_lock (void) MONO_INTERNAL;
901 void sgen_gc_unlock (void) MONO_INTERNAL;
902 void sgen_gc_event_moves (void) MONO_INTERNAL;
904 void sgen_queue_finalization_entry (MonoObject *obj) MONO_INTERNAL;
905 const char* sgen_generation_name (int generation) MONO_INTERNAL;
907 void sgen_collect_bridge_objects (int generation, ScanCopyContext ctx) MONO_INTERNAL;
908 void sgen_finalize_in_range (int generation, ScanCopyContext ctx) MONO_INTERNAL;
909 void sgen_null_link_in_range (int generation, gboolean before_finalization, ScanCopyContext ctx) MONO_INTERNAL;
910 void sgen_null_links_for_domain (MonoDomain *domain, int generation) MONO_INTERNAL;
911 void sgen_remove_finalizers_for_domain (MonoDomain *domain, int generation) MONO_INTERNAL;
912 void sgen_process_fin_stage_entries (void) MONO_INTERNAL;
913 void sgen_process_dislink_stage_entries (void) MONO_INTERNAL;
914 void sgen_register_disappearing_link (MonoObject *obj, void **link, gboolean track, gboolean in_gc) MONO_INTERNAL;
916 gboolean sgen_drain_gray_stack (int max_objs, ScanCopyContext ctx) MONO_INTERNAL;
924 void sgen_pin_object (void *object, SgenGrayQueue *queue) MONO_INTERNAL;
925 void sgen_parallel_pin_or_update (void **ptr, void *obj, MonoVTable *vt, SgenGrayQueue *queue) MONO_INTERNAL;
926 void sgen_set_pinned_from_failed_allocation (mword objsize) MONO_INTERNAL;
928 void sgen_ensure_free_space (size_t size) MONO_INTERNAL;
929 void sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish) MONO_INTERNAL;
930 gboolean sgen_has_critical_method (void) MONO_INTERNAL;
931 gboolean sgen_is_critical_method (MonoMethod *method) MONO_INTERNAL;
938 gboolean is_overflow;
939 SGEN_TV_DECLARE (total_time);
940 SGEN_TV_DECLARE (stw_time);
941 SGEN_TV_DECLARE (bridge_time);
944 int sgen_stop_world (int generation) MONO_INTERNAL;
945 int sgen_restart_world (int generation, GGTimingInfo *timing) MONO_INTERNAL;
946 void sgen_init_stw (void) MONO_INTERNAL;
950 typedef struct _LOSObject LOSObject;
953 mword size; /* this is the object size, lowest bit used for pin/mark */
954 guint8 *cardtable_mod_union; /* only used by the concurrent collector */
955 #if SIZEOF_VOID_P < 8
956 mword dummy; /* to align object to sizeof (double) */
958 char data [MONO_ZERO_LEN_ARRAY];
961 extern LOSObject *los_object_list;
962 extern mword los_memory_usage;
964 void sgen_los_free_object (LOSObject *obj) MONO_INTERNAL;
965 void* sgen_los_alloc_large_inner (MonoVTable *vtable, size_t size) MONO_INTERNAL;
966 void sgen_los_sweep (void) MONO_INTERNAL;
967 gboolean sgen_ptr_is_in_los (char *ptr, char **start) MONO_INTERNAL;
968 void sgen_los_iterate_objects (IterateObjectCallbackFunc cb, void *user_data) MONO_INTERNAL;
969 void sgen_los_iterate_live_block_ranges (sgen_cardtable_block_callback callback) MONO_INTERNAL;
970 void sgen_los_scan_card_table (gboolean mod_union, SgenGrayQueue *queue) MONO_INTERNAL;
971 void sgen_los_update_cardtable_mod_union (void) MONO_INTERNAL;
972 void sgen_los_count_cards (long long *num_total_cards, long long *num_marked_cards) MONO_INTERNAL;
973 void sgen_major_collector_scan_card_table (SgenGrayQueue *queue) MONO_INTERNAL;
974 gboolean sgen_los_is_valid_object (char *object) MONO_INTERNAL;
975 gboolean mono_sgen_los_describe_pointer (char *ptr) MONO_INTERNAL;
976 LOSObject* sgen_los_header_for_object (char *data) MONO_INTERNAL;
977 mword sgen_los_object_size (LOSObject *obj) MONO_INTERNAL;
978 void sgen_los_pin_object (char *obj) MONO_INTERNAL;
979 void sgen_los_unpin_object (char *obj) MONO_INTERNAL;
980 gboolean sgen_los_object_is_pinned (char *obj) MONO_INTERNAL;
983 /* nursery allocator */
985 void sgen_clear_nursery_fragments (void) MONO_INTERNAL;
986 void sgen_nursery_allocator_prepare_for_pinning (void) MONO_INTERNAL;
987 void sgen_nursery_allocator_set_nursery_bounds (char *nursery_start, char *nursery_end) MONO_INTERNAL;
988 mword sgen_build_nursery_fragments (GCMemSection *nursery_section, void **start, size_t num_entries, SgenGrayQueue *unpin_queue) MONO_INTERNAL;
989 void sgen_init_nursery_allocator (void) MONO_INTERNAL;
990 void sgen_nursery_allocator_init_heavy_stats (void) MONO_INTERNAL;
991 void sgen_alloc_init_heavy_stats (void) MONO_INTERNAL;
992 char* sgen_nursery_alloc_get_upper_alloc_bound (void) MONO_INTERNAL;
993 void* sgen_nursery_alloc (size_t size) MONO_INTERNAL;
994 void* sgen_nursery_alloc_range (size_t size, size_t min_size, size_t *out_alloc_size) MONO_INTERNAL;
995 MonoVTable* sgen_get_array_fill_vtable (void) MONO_INTERNAL;
996 gboolean sgen_can_alloc_size (size_t size) MONO_INTERNAL;
997 void sgen_nursery_retire_region (void *address, ptrdiff_t size) MONO_INTERNAL;
999 void sgen_nursery_alloc_prepare_for_minor (void) MONO_INTERNAL;
1000 void sgen_nursery_alloc_prepare_for_major (void) MONO_INTERNAL;
1002 char* sgen_alloc_for_promotion (char *obj, size_t objsize, gboolean has_references) MONO_INTERNAL;
1003 char* sgen_par_alloc_for_promotion (char *obj, size_t objsize, gboolean has_references) MONO_INTERNAL;
1007 extern MonoNativeTlsKey thread_info_key;
1009 #ifdef HAVE_KW_THREAD
1010 extern __thread SgenThreadInfo *sgen_thread_info;
1011 extern __thread char *stack_end;
1014 #ifdef HAVE_KW_THREAD
1015 #define TLAB_ACCESS_INIT
1016 #define IN_CRITICAL_REGION sgen_thread_info->in_critical_region
1018 #define TLAB_ACCESS_INIT SgenThreadInfo *__thread_info__ = mono_native_tls_get_value (thread_info_key)
1019 #define IN_CRITICAL_REGION (__thread_info__->in_critical_region)
1022 #ifndef DISABLE_CRITICAL_REGION
1024 #ifdef HAVE_KW_THREAD
1025 #define IN_CRITICAL_REGION sgen_thread_info->in_critical_region
1027 #define IN_CRITICAL_REGION (__thread_info__->in_critical_region)
1030 /* Enter must be visible before anything is done in the critical region. */
1031 #define ENTER_CRITICAL_REGION do { mono_atomic_store_acquire (&IN_CRITICAL_REGION, 1); } while (0)
1033 /* Exit must make sure all critical regions stores are visible before it signal the end of the region.
1034 * We don't need to emit a full barrier since we
1036 #define EXIT_CRITICAL_REGION do { mono_atomic_store_release (&IN_CRITICAL_REGION, 0); } while (0)
1040 #ifdef HAVE_KW_THREAD
1042 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1043 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1044 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1045 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1048 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1049 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1050 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1051 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1056 #if defined(__APPLE__) || defined (HOST_WIN32)
1057 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1058 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1059 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1060 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1061 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1062 mono_mb_emit_byte ((mb), CEE_ADD); \
1063 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1066 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1067 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1068 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1069 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1070 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1071 mono_mb_emit_byte ((mb), CEE_ADD); \
1072 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1076 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1077 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1084 extern GCMemSection *nursery_section;
1085 extern guint32 collect_before_allocs;
1086 extern guint32 verify_before_allocs;
1087 extern gboolean has_per_allocation_action;
1088 extern size_t degraded_mode;
1089 extern int default_nursery_size;
1090 extern guint32 tlab_size;
1091 extern NurseryClearPolicy nursery_clear_policy;
1092 extern gboolean sgen_try_free_some_memory;
1094 extern LOCK_DECLARE (gc_mutex);
1096 extern int do_pin_stats;
1098 /* Nursery helpers. */
1101 sgen_set_nursery_scan_start (char *p)
1103 size_t idx = (p - (char*)nursery_section->data) / SGEN_SCAN_START_SIZE;
1104 char *old = nursery_section->scan_starts [idx];
1105 if (!old || old > p)
1106 nursery_section->scan_starts [idx] = p;
1110 /* Object Allocation */
1118 } SgenAllocatorType;
1120 void sgen_init_tlab_info (SgenThreadInfo* info);
1121 void sgen_clear_tlabs (void);
1122 void sgen_set_use_managed_allocator (gboolean flag);
1123 gboolean sgen_is_managed_allocator (MonoMethod *method);
1124 gboolean sgen_has_managed_allocator (void);
1128 void sgen_check_consistency (void);
1129 void sgen_check_mod_union_consistency (void);
1130 void sgen_check_major_refs (void);
1131 void sgen_check_whole_heap (gboolean allow_missing_pinning);
1132 void sgen_check_whole_heap_stw (void) MONO_INTERNAL;
1133 void sgen_check_objref (char *obj);
1134 void sgen_check_major_heap_marked (void) MONO_INTERNAL;
1135 void sgen_check_nursery_objects_pinned (gboolean pinned) MONO_INTERNAL;
1136 void sgen_scan_for_registered_roots_in_domain (MonoDomain *domain, int root_type) MONO_INTERNAL;
1137 void sgen_check_for_xdomain_refs (void) MONO_INTERNAL;
1139 void mono_gc_scan_for_specific_ref (MonoObject *key, gboolean precise) MONO_INTERNAL;
1141 /* Write barrier support */
1144 * This causes the compile to extend the liveness of 'v' till the call to dummy_use
1147 sgen_dummy_use (gpointer v) {
1148 #if defined(__GNUC__)
1149 __asm__ volatile ("" : "=r"(v) : "r"(v));
1150 #elif defined(_MSC_VER)
1151 static volatile gpointer ptr;
1154 #error "Implement sgen_dummy_use for your compiler"
1158 /* Environment variable parsing */
1160 #define MONO_GC_PARAMS_NAME "MONO_GC_PARAMS"
1161 #define MONO_GC_DEBUG_NAME "MONO_GC_DEBUG"
1163 gboolean sgen_parse_environment_string_extract_number (const char *str, size_t *out) MONO_INTERNAL;
1164 void sgen_env_var_error (const char *env_var, const char *fallback, const char *description_format, ...) MONO_INTERNAL;
1168 void sgen_qsort (void *base, size_t nel, size_t width, int (*compar) (const void*, const void*)) MONO_INTERNAL;
1169 gint64 sgen_timestamp (void) MONO_INTERNAL;
1171 #endif /* HAVE_SGEN_GC */
1173 #endif /* __MONO_SGENGC_H__ */